# Math Journal HMH Mega Math. itools Number

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2 Lesson 1.2 Round to the Nearest Ten or Hundred CC.3.NBT.1 Use place value understanding to round whole numbers to the nearest 10 or 100. Round 2- and 3-digit numbers to the nearest ten or hundred. How can you round numbers? Animated Math Models HMH Mega Math activity is for students to use place value and estimation to round numbers. As students work through Unlock the Problem, gauge their level of understanding to make better decisions about how to progress through place value and rounding to develop sound mathematical practices by asking these questions. When rounding a number, what information do you need? What strategy would you use to round a given number? What happens if you use another strategy? to Intervention). once they understand these rounding concepts. Select exercises based on Exercises How can you round numbers? I can use a number line or place value. Describe how to round 678 to the nearest hundred. 28 Chapter 1 3_MNYCETS225572_C01RML02.indd 28 09/05/13 2:49 PM NYC38 New York City Implementation Guide

3 Lesson 1.3 Estimate Sums CC.3.NBT.1 Use place value understanding to round whole numbers to the nearest 10 or 100. Also CC.3.NBT.2 Use compatible numbers and rounding to estimate sums. How can you use compatible numbers and rounding to estimate sums? Animated Math Models activity is for students to estimate sums. As students work through Unlock the Problem, gauge their level of understanding to make better decisions about how to progress through rounding and estimation to develop sound mathematical practices by asking these questions. Why did you decide to use compatible numbers to estimate? Rounding to estimate? How do you know your answer is reasonable? How can you use math vocabulary to explain your process of estimation? to Intervention). once they understand these estimation concepts. Select exercises based on Exercises How can you use compatible numbers and rounding to estimate sums? I can use compatible numbers by finding a number that is close to the given number, but easier to add. I can round the numbers to the same place to estimate sums. Explain how to estimate two different ways. Chapter _MNYCETS225572_C01RML03.indd 29 09/05/13 2:56 PM New York City Implementation Guide NYC39

4 Lesson 1.4 Mental Math Strategies for Addition CC.3.NBT.2 Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction. Count by tens and ones, use a number line, make compatible numbers, or use friendly numbers to find sums mentally. What mental math strategies can you use to find sums? itools: Number Lines activity is for students to use mental math to find sums. As students work through Unlock the Problem, gauge their level of understanding to make better decisions about how to progress through addition strategies to develop sound mathematical practices by asking these questions. Will the method of compatible numbers always work? How do you know? Is there a strategy you could use to make the given problem easier? How do you know your answer is reasonable? to Intervention). once they understand these mental math strategies. Select exercises based on Exercises 10, 11 What mental math strategies can you use to find sums? You could count by tens and ones, use compatible numbers or use friendly numbers and adjust. Which method do you prefer to use to find sums count by tens and ones, use compatible numbers, or use friendly numbers and adjust? Explain why. 30 Chapter 1 3_MNYCETS225572_C01RML04.indd 30 09/05/13 3:02 PM NYC40 New York City Implementation Guide

8 Lesson 1.8 Estimate Differences CC.3.NBT.1 Use place value understanding to round whole numbers to the nearest 10 or 100. Also CC.3.NBT.2 Use compatible numbers and rounding to estimate differences. How can you use compatible numbers and rounding to estimate differences? Animated Math Models activity is for students to estimate differences. As students work through Unlock the Problem, gauge their level of understanding to make better decisions about how to progress through compatible numbers and estimation to develop sound mathematical practices by asking these questions. What do you remember about using compatible numbers? What other ways can you estimate? In the given problem, why did you choose the strategy you used? How do you know your answer is reasonable? to Intervention). once they understand these estimation and subtraction concepts. Select exercises based on Exercises How can you use compatible numbers and rounding to estimate differences? I can find numbers that are close to the real numbers and are easier to subtract. Then I subtract to estimate the difference. Or I can round the numbers to the same place and subtract the rounded numbers to get an estimate. Explain how to estimate two different ways. 34 Chapter 1 3_MNYCETS225572_C01RML08.indd 34 09/05/13 3:28 PM NYC44 New York City Implementation Guide

9 Lesson 1.9 Mental Math Strategy for Subtraction CC.3.NBT.2 Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction. Use a number line, friendly numbers, or the break apart strategy to find differences mentally. What mental math strategies can you use to find differences? itools: Number Lines activity is for students to use strategies to find differences mentally. As students work through Unlock the Problem, gauge their level of understanding to make better decisions about how to progress through subtraction to develop sound mathematical practices by asking these questions. What strategy can you use to solve the given problem? How do you know? Will that method always work? When might it not work? When using friendly numbers, what patterns do you see? to Intervention). once they understand these subtraction strategies. Select exercises based on Exercises 5, 7, 9 What mental math strategies can you use to find differences? I can use a number line to count up by tens and ones, or take away tens and ones. I can use friendly numbers or I can use the break apart strategy. Give one example of when you would use the friendly numbers strategy to subtract. Explain why. Chapter _MNYCETS225572_C01RML09.indd 35 09/05/13 3:37 PM New York City Implementation Guide NYC45

10 Lesson 1.10 Use Place Value to Subtract CC.3.NBT.2 Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction. Also CC.3.NBT.1 Use place value to subtract 3-digit numbers. How can you use place value to subtract 3-digit numbers? itools: Base-Ten Blocks HMH Mega Math Animated Math Models activity is for students to use place value to subtract 3-digit numbers. As students work through Unlock the Problem, gauge their level of understanding to make better decisions about how to progress through subtracting two-digit numbers to develop sound mathematical practices by asking these questions. What is the given problem asking? What strategy can you use to make the calculation easier? What do you remember about regrouping? How do you know your answer is reasonable? to Intervention). once they understand these subtraction concepts. Select exercises based on Exercises or How can you use place value to subtract 3-digit numbers? I can subtract the numbers in each place and regroup when I need to. Explain how to subtract 247 from Chapter 1 3_MNYCETS225572_C01RML10.indd 36 14/05/13 12:23 PM NYC46 New York City Implementation Guide

11 Lesson 1.11 Combine Place Value to Subtract CC.3.NBT.2 Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction. Also CC.3.NBT.1, CC.3.OA.8 Use the combined place values strategy to subtract 3-digit numbers. How can you use the combined place values strategy to subtract 3-digit numbers? itools: Base-Ten Blocks activity is for students to use place value to subtract three-digit numbers. As students work through Unlock the Problem, gauge their level of understanding to make better decisions about how to progress through representing numbers in different ways to develop sound mathematical practices by asking these questions. Which operation should you use to solve the given problem? How do you know? What is the best strategy to use to solve the given problem? How do you know? What did you do first when solving the given problem? Why? to Intervention). once they understand these subtraction concepts. Select exercises based on Exercises How can you use the combined place values strategy to subtract 3-digit numbers? If there are not enough in the place, combine the tens and ones, or combine the hundreds and tens and then subtract. Explain how to use the combined place values strategy to find Chapter _MNYCETS225572_C01RML11.indd 37 09/05/13 3:45 PM New York City Implementation Guide NYC47

13 Lesson 2.1 Problem Solving Organize Data CC.3.MD.3 Draw a scaled picture graph and a scaled bar graph to represent a data set with several categories. Solve one- and two-step how many more and how many less problems using information presented in scaled bar graphs. Also CC.3.NBT.2 Organize data in tables and solve problems by using the strategy make a table. How can you use the strategy make a table to organize data and solve problems? Animated Math Models activity is for students to organize data to solve problems. As students work through Unlock the Problem, gauge their level of understanding to make better decisions about how to progress through using tables to organize data to develop sound mathematical practices by asking these questions. What strategy did you use to solve the given problem? Can you think of another way to solve the given problem? Have you solved a problem similar to this one? How can you use math vocabulary in your explanation? to Intervention). once they understand this problem solving strategy. Select exercises based on Exercises 6, 7, 9 How can you use the strategy make a table to organize data and solve problems? I can represent the number of tally marks in a frequency table. Then, I can use the numbers in the table to solve problems. How can you use the strategy make a table to organize data and solve problems? Chapter _MNYCETS225572_C02RML01.indd 41 09/05/13 4:38 PM New York City Implementation Guide NYC49

15 Lesson 2.3 Make Picture Graphs CC.3.MD.3 Draw a scaled picture graph and a scaled bar graph to represent a data set with several categories. Solve one- and two-step how many more and how many less problems using information presented in scaled bar graphs. Also CC.3.NBT.2 Draw a scaled picture graph to show data in a table. How can you draw a scaled picture graph to show data in a table? HMH Mega Math itools: Graphs Animated Math Models activity is for students to make and interpret a scaled picture graph. As students work through Unlock the Problem, gauge their level of understanding to make better decisions about how to progress through picture graphs to develop sound mathematical practices by asking these questions. Have you ever solved a problem similar to this? Can you use math vocabulary in your answer? Will the method of having a symbol equal more than one always work when displaying data? How do you know? to Intervention). once they understand these data concepts. Select exercises based on students depth of understanding. The exercises below require higher order thinking skills and critical reasoning, making them especially rich. Exercises 3, 5, 6 or 7 9 How can you draw a scaled picture graph to show data in a table? Write the title at the top of the picture graph. Label the rows. Choose a key and symbols that will represent the data. Than draw the correct number of symbols in each row. Describe why it might not be a good idea to use a key where each symbol stands for 1 in a picture graph. Chapter _MNYCETS225572_C02RML03.indd 43 14/05/13 12:25 PM New York City Implementation Guide NYC51

16 Lesson 2.4 Use Bar Graphs CC.3.MD.3 Draw a scaled picture graph and a scaled bar graph to represent a data set with several categories. Solve one- and two-step how many more and how many less problems using information presented in scaled bar graphs. Also CC.3.NBT.2 Read and interpret data in a scaled bar graph. How can you read and interpret data in a scaled bar graph? Animated Math Models HMH Mega Math activity is for students to read and interpret bar graphs. As students work through Unlock the Problem, gauge their level of understanding to make better decisions about how to progress through displaying data to develop sound mathematical practices by asking these questions. What is the given problem asking? What do you think will happen if you change the key? What operation did you use to solve the given problem? Is there another way to solve the given problem? to Intervention). once they understand these data display concepts. Select exercises based on Exercises 6 8 How can you read and interpret data in a scaled bar graph? First, I look at the title and the labels to know what the graph is about. Then, I look at the scale and the length of each bar to find the value. Use Kate s Favorite Amusement Ride bar graph to describe what the bar for Super Slide means. 44 Chapter 2 3_MNYCETS225572_C02RML04.indd 44 09/05/13 4:52 PM NYC52 New York City Implementation Guide

17 Lesson 2.5 Make Bar Graphs CC.3.MD.3 Draw a scaled picture graph and a scaled bar graph to represent a data set with several categories. Solve one- and two-step how many more and how many less problems using information presented in scaled bar graphs. Also CC.3.NBT.2 Draw a scaled bar graph to show data on a table or picture graph. How can you draw a scaled bar graph to show data on a table or picture graph? HMH Mega Math itools: Graphs Animated Math Models activity is for students to make and interpret bar graphs. As students work through Unlock the Problem, gauge their level of understanding to make better decisions about how to progress through data displays to develop sound mathematical practices by asking these questions. What strategies can you use to interpret data that do not fit exactly to the line on the graph? What math vocabulary can you use in your answer? Why is the data model you chose the best for the given problem? to Intervention). once they understand these data display concepts. Select exercises based on Exercises 9, 10, 11 How can you draw a scaled bar graph to show data on a table or picture graph? Write a title and labels and draw a scale so that most of the data will end on a line. Draw bars to show the numbers for each category. Have students use the data on page 82 and explain how to draw a bar for a player named Eric who scored 20 points. Chapter _MNYCETS225572_C02RML05.indd 45 14/05/13 12:29 PM New York City Implementation Guide NYC53

18 Lesson 2.6 Solve Problems Using Data CC.3.MD.3 Draw a scaled picture graph and a scaled bar graph to represent a data set with several categories. Solve one- and two-step how many more and how many less problems using information presented in scaled bar graphs. Also CC.3.NBT.2, CC.3.OA.8 Solve one- and two-step compare problems using data represented in scaled bar graphs. How can you solve problems using data represented in bar graphs? HMH Mega Math itools: Graphs Animated Math Models how deeply to discuss. activity is for students to solve problems using data represented in graphs. As students work through Unlock the Problem, gauge their level of understanding to make better decisions about how to progress through displaying data to develop sound mathematical practices by asking these questions. What is the given problem asking? What information do you need? Is there another way to represent and solve the given problem? How do you know your answer is reasonable? Students can begin independent practice once they understand these problem-solving concepts. Select exercises based on students depth of understanding. The exercises below require higher order thinking skills and critical reasoning, making them especially rich. Exercises 7, 8, 9 How can you solve problems using data represented in bar graphs? I can read the bar graph to find and use the data I need. I can count along the scale to compare the data. Write a word problem that can be solved by using the November Weather bar graph. 46 Chapter 2 3_MNYCETS225572_C02RML06.indd 46 5/10/13 8:06 PM NYC54 New York City Implementation Guide

19 Lesson 2.7 Use and Make Line Plots CC.3.MD.4 Generate measurement data by measuring lengths using rulers marked with halves and fourths of an inch. Show the data by making a line plot, where the horizontal scale is market off in appropriate units whole numbers, halves, or quarters. Also CC.3.NBT.2 Read and interpret data in a line plot and use data to make a line plot. How can you read and interpret data in a line plot and use data to make a line plot? HMH Mega Math itools: Graphs activity is for students to read, interpret, and make line plots. As students work through Unlock the Problem, gauge their level of understanding to make better decisions about how to progress through data displays to develop sound mathematical practices by asking these questions. What information are you being asked to find? What will you do first? How do you know? What new math vocabulary can you use in your answer? once they understand these data display concepts. Select exercises based on The exercises below require higher order Exercises 4, 5, 6 How can you read and interpret data in a line plot and use data to make a line plot? Write a title and write numbers in order on a number line. Draw X s above the numbers to represent the data. Use the data in the line plot to solve the problems. Have students write and solve another problem using the data in the Daily High Temperatures line plot. Chapter _MNYCETS225572_C02RML07.indd 47 11/05/13 7:43 PM New York City Implementation Guide NYC55

20 Lesson 3.1 Count Equal Groups CC.3.OA.1 Interpret products of whole numbers, e.g., interpret as the total number of objects in 5 groups of 7 objects each. Also CC.3.OA.3 Model and skip count objects in equal groups to find how many there are. How can you use equal groups to find how many in all? HMH Mega Math counters itools: Counters itools: Number Lines Animated Math Models activity is for students to relate skip counting with multiplication. As students work through Unlock the Problem, gauge their level of understanding to make better decisions about how to progress through modeling numbers to develop sound mathematical practices by asking these questions. What is the given problem asking? What do you remember about skip counting? What strategy could you use to make the given problem easier? to Intervention). once they understand these skip counting concepts. Select exercises based on Exercises 6, 8, 9 How can you use equal groups to find how many in all? I can skip count the groups by using drawings or counters. 50 Chapter 3 3_MNYCETS225572_C03RML01.indd 50 14/05/13 12:33 PM NYC56 New York City Implementation Guide

22 Lesson 3.3 Skip Count on a Number Line CC.3.OA.3 Use multiplication and division within 100 to solve word problems in situations involving equal groups, arrays, and measurement quantities, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem. Also CC.3.OA.1 Model and skip count on a number line to find how many there are. How can you use a number line to skip count and find how many in all? HMH Mega Math itools: Number Lines Animated Math Models for this lesson, in which conceptual development is key. The goal of this activity is for students to use skip counting on the number line to multiply. As students work through Unlock the Problem, gauge their level of understanding to make better decisions about how to progress through skip counting and number lines to develop sound mathematical practices by asking these questions. How will you use the given information to solve the problem? What did you do first? Why? Why is the number line a good model for the given problem? What strategy could you use to make the given problem easier to solve? to Intervention). once they understand these skip counting concepts. Select exercises based on Exercises 10, 11, 12 How can you use a number line to skip count and find how many in all? I can use the number of groups for the number of times to skip count on the number line. I can use the number in each group as the number to skip count by. Write a problem that can be solved by skip counting on a number line. 52 Chapter 3 3_MNYCETS225572_C03RML03.indd 52 09/05/13 4:07 PM NYC58 New York City Implementation Guide

23 Lesson 3.4 Problem Solving Model Multiplication CC.3.OA.8 Solve two-step word problems using the four operations. Represent these problems using equations with a letter standing for the unknown quantity. Assess the reasonableness of answers using mental computation and estimation strategies including rounding. Also CC.3.OA.1, CC.3.OA.3 Solve one- and two-step problems by using the strategy draw a diagram. How can you use the strategy draw a diagram to solve one- and two-step problems? HMH Mega Math itools: Counters 2 TEACH Teach and and Talk TALK Approximately for this lesson, in which conceptual development is key. The goal of this activity is for students to use bar models to solve multiplication problems. As students work through Unlock the Problem, gauge their level of understanding to make better decisions about how to progress through modeling to develop sound mathematical practices by asking these questions. What is the problem asking? Why is this a good model for the given problem? What operation did you use to represent the situation? How does your drawing represent your work? to Intervention). once they understand these problem solving concepts. Select exercises based on Exercises 5, 7, 8 How can you use the strategy draw a diagram to solve one- and two-step problems? I can draw a diagram to show the information in the problem and use the diagram to determine what operation to use to solve the problem. Describe one kind of diagram you might draw to help you solve a problem. Chapter _MNYCETS225572_C03RML04.indd 53 09/05/13 4:12 PM New York City Implementation Guide NYC59

24 Lesson 3.5 Model with Arrays CC.3.OA.3 Use multiplication and division within 100 to solve word problems in situations involving equal groups, arrays, and measurement quantities, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem. Also CC.3.OA.1 Use arrays to model products and factors. How can you use arrays to model multiplication and find factors? square tiles Animated Math Models HMH Mega Math itools: Counters activity is for students to use arrays to multiply. As students work through Unlock the Problem, gauge their level of understanding to make better decisions about how to progress through multiplication to develop sound mathematical practices by asking these questions. What is the problem asking? Why are math tiles a good model for the given problem? How would you change your model if the number in the given groups changed? Are there any properties being represented in the model? to Intervention). once they understand these multiplication concepts. Select exercises based on Exercises 11, 12, 13 How can you use arrays to model multiplication and find factors? The number of rows is the first factor and the number in each row is the second factor. Write a word problem that can be solved by drawing an array. Then draw the array and solve the problem. 54 Chapter 3 3_MNYCETS225572_C03RML05.indd 54 09/05/13 4:17 PM NYC60 New York City Implementation Guide

25 Lesson 3.6 Algebra Commutative Property of Multiplication CC.3.OA.5 Apply properties of operations as strategies to multiply and divide. Also CC.3.OA.1, CC.3.OA.3, CC.3.0A.7 Model the Commutative Property of Multiplication and use it to find products. How can you use the Commutative Property of Multiplication to find products? square tiles Animated Math Models HMH Mega Math itools: Number Charts 2 Teach TEACH and and Talk TALK Approximately activity is for students to model and use the Commutative Property of Multiplication. As students work through Unlock the Problem, gauge their level of understanding to make better decisions about how to progress through modeling multiplication to develop sound mathematical practices by asking these questions. Which operation did you use? Why is the array a good model for this problem? How does the model support your work? How can you use the Commutative Property of Multiplication in the given problem? to Intervention). once they understand the Commutative Property of Multiplication. Select exercises based on The exercises below require higher order Exercises 8, 11, 13 or How can you use the Commutative Property of Multiplication to find products? When I know one fact, I can use the Commutative property to find the answer to a related fact. For example, if I know , then I know Chapter _MNYCETS225572_C03RML06.indd 55 5/14/13 2:22 PM New York City Implementation Guide NYC61

26 Lesson 3.7 Algebra Multiply with 1 and 0 CC.3.OA.5 Apply properties of operations as strategies to multiply and divide. Also CC.3.OA.1, CC.3.OA.3, CC.3.0A.7 Model multiplication with the factors 1 and 0. What happens when you multiply a number by 0 or 1? HMH Mega Math itools: Number Lines Animated Math Models activity is for students to understand the identity and zero properties of multiplication. As students work through Unlock the Problem, gauge their level of understanding to make better decisions about how to progress through multiplication to develop sound mathematical practices by asking these questions. What do you remember about skip counting? What conclusions can you draw from the model? What properties can you use to solve the given problem? Why? to Intervention). once they understand these multiplication concepts. Select exercises based on Exercises or What happens when you multiply a number by 0 or 1? When I multiply a number by 0, the product is 0. When I multiply a number by 1, the product is that number. 56 Chapter 3 3_MNYCETS225572_C03RML07.indd 56 5/14/13 2:28 PM NYC62 New York City Implementation Guide

27 Lesson 4.1 Multiply with 2 and 4 CC.3.OA.3 Use multiplication and division within 100 to solve word problems in situations involving equal groups, arrays, and measurement quantities, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem. Also CC.3.OA.1, CC.3.0A.7 Draw a picture, count by 2s, or use doubles to multiply with the factors 2 and 4. How can you multiply with 2 and 4? Animated Math Models itools: Base-Ten Blocks itools: Counters itools: Number Lines activity is for students to use different strategies to multiply with the factors 2 and 4. As students work through Unlock the Problem, gauge their level of understanding to make better decisions about how to progress through multiplication to develop sound mathematical practices by asking these questions. What is the given problem asking? Is there another way to solve the given problem? What math vocabulary can you use? Are your answers reasonable? once they understand these multiplication strategies. Select exercises based on The exercises below require higher order Exercises 23, 24, 25 or 26, 27 How can you multiply with 2 and 4? To multiply by 2, I can draw a picture, add doubles or count by 2 s. To multiply by 4, I can draw a picture of multiply the other factor by 2 and double the product. Explain how you can use doubles when multiplying with 4 to find Chapter _MNYCETS225572_C04RML01.indd 59 5/10/13 9:35 PM New York City Implementation Guide NYC63

28 Lesson 4.2 Multiply with 5 and 10 CC.3.OA.3 Use multiplication and division within 100 to solve word problems in situations involving equal groups, arrays, and measurement quantities, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem. Also CC.3.OA.1, CC.3.0A.7 Use skip counting, a number line, or a bar model to multiply with the factors 5 and 10. How can you multiply with 5 and 10? Animated Math Models HMH Mega Math itools: Counters itools: Number Lines This activity reviews prerequisite skills. You can include or skip this activity. Use evidence of students understanding to make decisions like this throughout the lesson. 2 Teach TEACH and and Talk TALK Approximately activity is for students to use different strategies to multiply with 5 and 10. As students work through Unlock the Problem, gauge their level of understanding to make better decisions about how to progress through multiplication to develop sound mathematical practices by asking these questions. What strategy could you use to solve the given problem? Is there another way to solve the given problem? What math vocabulary can you use when solving the given problem? Are your answers reasonable? once they understand these multiplication strategies. Select exercises based on The exercises below require higher order Exercises 34, 35, 37 or How can you multiply with 5 and 10? I could skip count, use a bar model, make a drawing or use a number line. 60 Chapter 4 3_MNYCETS225572_C04RML02.indd 60 5/14/13 2:30 PM NYC64 New York City Implementation Guide

29 Lesson 4.3 Multiply with 3 and 6 CC.3.OA.3 Use multiplication and division within 100 to solve word problems in situations involving equal groups, arrays, and measurement quantities, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem. Also CC.3.OA.1, CC.3.0A.7, CC.3.OA.9 Draw a picture, use 5s facts and addition, doubles, or a multiplication table to multiply with the factors 3 and 6. What are some ways to multiply with 3 and 6? itools: Counters itools: Number Charts Animated Math Models This activity reviews prerequisite skills. You can include or skip this activity. Use evidence of students understanding to make decisions like this throughout the lesson. activity is for students to use different strategies to multiply with 5 and 10. As students work through Unlock the Problem, gauge their level of understanding to make better decisions about how to progress through multiplication to develop sound mathematical practices by asking these questions. Have you solved a problem similar to this one? Describe the problem. What strategy could you use to solve the given problem? Is there another strategy you could use to solve the given problem? Are your answers reasonable? once they understand these multiplication strategies. Select exercises based on Exercises 34, 35, 37 or How can you multiply with 3 and 6? I can draw a picture, use 5 s facts and addition, a multiplication table, or doubles. Explain how multiplying with 6 is like multiplying with 3. Chapter _MNYCETS225572_C04RML03.indd 61 5/14/13 2:30 PM New York City Implementation Guide NYC65

30 Lesson 4.4 Algebra Distributive Property Note: The instructional time for this lesson can be 2 days. On Day 1, complete the Activity and Math Talk. Have students use counters to model 6 x 8. Relate the strategy used on p. 142 to the Distributive Property. On Day 2, in Try This! break apart 6 in other ways, then break apart 9. Complete Share and Show. Assign On Your Own for homework. CC.3.OA.5 Apply properties of operations as strategies to multiply and divide. Also CC.3.OA.1, CC.3.0A.3, CC.3.OA.4, CC.3.OA.7 Use the Distributive Property to find products by breaking apart arrays. How can you use the Distributive Property to find products? square tiles HMH Mega Math how deeply to discuss. activity is for students to draw and break apart arrays to model the Distributive Property. As students work through Unlock the Problem, gauge their level of understanding to make better decisions about how to progress through multiplication to develop sound mathematical practices by asking these questions. What is the problem asking? What did you do first, and why? What properties did you use to solve the given problem? What happens when you break down the array into a smaller size? once they understand the Distributive Property. Select exercises based on The exercises below require higher order Exercises 6, 7, 9 How can you use the Distributive Property to find products? I can break apart one of the factors and multiply each addend by the other factor. Then I can add the products to find the answer. 62 Chapter 4 3_MNYCETS225572_C04RML04.indd 62 14/05/13 7:10 PM NYC66 New York City Implementation Guide

31 Lesson 4.5 Multiply with 7 CC.3.OA.7 Fluently multiply and divide with 100, using strategies such as the relationship between multiplication and division (e.g., knowing that , one knows ) or properties of operations. By the end of Grade 3, know from memory all products of two one-digit numbers. Also CC.3.OA.1, CC.3.0A.3, CC.3.OA.4, CC.3.OA.5 Use the Commutative or Distributive Property or known facts to multiply with the factor 7. What strategies can you use to multiply with 7? itools: Base-Ten blocks itools: Counters activity is for students to use different strategies or properties to multiply with the factor 7. As students work through Unlock the Problem, gauge their level of understanding to make better decisions about how to progress through multiplication properties to develop sound mathematical practices by asking these questions. Which operation did you use to represent the situation? Is there another operation you could use? How can you use a simpler problem to help you find the answer? What properties did you use to solve the given problem? once they understand these different multiplication strategies. Select exercises based on students depth of understanding. The exercises below require higher order thinking skills and critical reasoning, making them especially rich. Exercises 23, 24, 26 What strategies can you use to multiply with 7? Use the distributive property to break the multiplication into smaller facts, or use the commutative property, or use doubles when at least one factor is even. Explain how you would use the Commutative Property of Multiplication to answer Chapter _MNYCETS225572_C04RML05.indd 63 11/05/13 7:49 PM New York City Implementation Guide NYC67

32 Lesson 4.6 Algebra Associative Property of Multiplication CC.3.OA.5 Apply properties of operations as strategies to multiply and divide. Also CC.3.OA.1, CC.3.0A.3, CC.3.OA.4, CC.3.OA.7 Use the Associative Property of Multiplication to multiply with three factors. How can you use the Associative Property of Multiplication to find products? Animated Math Models activity is for students to use the Associative property of Multiplication to multiply. As students work through Unlock the Problem, gauge their level of understanding to make better decisions about how to progress through multiplication properties to develop sound mathematical practices by asking these questions. Which property did you use to help solve the given problem? What do you remember about the Commutative Property? Is there another way to solve the given problem? What do you think will happen if you move the factors around? once they understand these multiplication concepts. Select exercises based on students depth of understanding. The exercises below require higher order thinking skills and critical reasoning, making them especially rich. Exercises or How can you use the Associative Property of Multiplication to find products? I can change the way the factors are grouped and still get the same answer. Why would you use the Associative Property of Multiplication to solve (10 3 4) 3 2? How would you regroup the factors? 64 Chapter 4 3_MNYCETS225572_C04RML06.indd 64 5/14/13 2:34 PM NYC68 New York City Implementation Guide

33 Lesson 4.7 Algebra Patterns on the Multiplication Table CC.3.OA.9 Identify arithmetic patterns (including patterns in the addition table or multiplication table), and explain them using properties of operations. Also CC.3.OA.5 Identify and explain patterns on the multiplication table. How can you use properties to explain patterns on the multiplication table? yellow and blue crayons itools: Numbers Chart foundation for the lesson. Use evidence of students understanding to decide how deeply to discuss. activity is for students to explain patterns on the multiplication table. As students work through Unlock the Problem, gauge their level of understanding to make better decisions about how to progress through multiplication and patterns to develop sound mathematical practices by asking these questions. What did you do first and why? What properties did you use to solve the given problem? What patterns can you find? How did you discover the patterns you see? once they understand multiplication patterns. Select exercises based on Exercises 14, 15, 16 How can you use properties to explain patterns on the multiplication table? I can use the commutative property to find patterns that show the same factors, but in a different order. I can also use the associative and distributive properties to find patterns for products that are even or odd. Chapter _MNYCETS225572_C04RML07.indd 65 5/10/13 11:03 PM New York City Implementation Guide NYC69

34 Lesson 4.8 Multiply with 8 CC.3.OA.7 Fluently multiply and divide with 100, using strategies such as the relationship between multiplication and division (e.g., knowing that , one knows ) or properties of operations. By the end of Grade 3, know from memory all products of two one-digit numbers. Also CC.3.OA.1, CC.3.0A.3, CC.3.OA.4, CC.3.OA.5, CC.3.OA.9 Use doubles, a number line, or Associative Property of Multiplication to multiply with the factor 8. What strategies can you use to multiply with 8? HMH Mega Math itools: Counters itools: Number Lines This activity reviews prerequisite skills. You can include or skip this activity. Use evidence of students understanding to make decisions like this throughout the lesson. 2 TEACH Teach and Talk TALKApproximately activity is for students to use different strategies or properties to multiply with 8. As students work through Unlock the Problem, gauge their level of understanding to make better decisions about how to progress through multiplication to develop sound mathematical practices by asking these questions. Which operation did you use to represent the situation? What strategy did you use to solve the given problem? Could you use another strategy? What do you remember about using doubles facts to solve problems? once they understand these multiplication strategies. Select exercises based on Exercises 20 27, 31 What strategies can you use to multiply with 8? I can use the Distributive Property to break 8 into two facts I know, or easier facts, I could use the Associative Property of Multiplication to work with a fact I know, arrays, doubles, quick pictures or skip counting on a number line can also be used to multiply 8. What two facts can you double to find 8 3 4? Explain. 66 Chapter 4 3_MNYCETS225572_C04RML08.indd 66 11/05/13 7:50 PM NYC70 New York City Implementation Guide

35 Lesson 4.9 Multiply with 9 Note: The instructional time for this lesson can be 2 days. On Day 1, have students draw arrays to model Unlock the Problem. Have them use their models to justify using the Distributive Property with Subtraction. On Day 2, Review Day 1. Then have students complete Another Way, Try This!, Share and Show. Do the exercises on page 169 as a class. CC.3.OA.7 Fluently multiply and divide with 100, using strategies such as the relationship between multiplication and division (e.g., knowing that , one knows ) or properties of operations. By the end of Grade 3, know from memory all products of two one-digit numbers. Also CC.3.OA.1, CC.3.0A.3, CC.3.OA.4, CC.3.OA.5, CC.3.OA.9 Use the Distributive Property with addition or subtraction or patterns to multiply with the factor 9. What strategies can you use to multiply with 9? Animated Math Models HMH Mega Math itools: Counters itools: Base-Ten Blocks This activity reviews prerequisite skills. You can include or skip this activity. Use evidence of students understanding to make decisions like this throughout the lesson. activity is for students to use the Distributive property or patterns to multiply with 9. As students work through Unlock the Problem, gauge their level of understanding to make better decisions about how to progress through multiplication properties and strategies to develop sound mathematical practices by asking these questions. What strategy can you use to solve the given problem? What properties are you able to use? Do you see any patterns in the given problem? How can use these to solve the given problem? once they understand these multiplication strategies. Select exercises based on Exercises or What strategies can you use to multiply with 9? Use patterns of 9. The sum of the digits of the product of 9 is always 9. The tens digit is always one less than the other factor. Chapter _MNYCETS225572_C04RML09.indd 67 5/14/13 2:35 PM New York City Implementation Guide NYC71

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