# OA3-23 Patterns in Multiplication of Odd Numbers

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1 OA-2 Patterns in Multiplication of Odd Numbers Pages 0 1 Standards:.OA.D. Goals: Students will find patterns in the multiplication of odd numbers Students will practice multiplication facts for odd numbers, particularly for multiples of and. Prior Knowledge Required: Can skip count by s Can write multiplication sentences Can model multiplication with equal groups Vocabulary: column, even, multiple, multiples, multiplication facts, multiply, odd, ones place, position, repeated addition, row, skip count, tens place, value Materials: BLM Odd Multiple Charts (p. E-64) BLM Skip Counting Chart (p. E-66) BLM Odd Multiples (p. E-6) Multiples of. Write on the board: 0,, 6,, 12, 15, 18, 21, 24, 2, 0 SAY: These numbers are the multiples of. They are the numbers you get when you multiply by. ASK: What is 1 times? () What is 2 times? (6) Write the multiplication sentences on the board and continue so that students help you complete the list below. 1 = 2 = 6 = 4 = 12 5 = 15 6 = 18 = 21 8 = 24 = 2 10 = 0 Teacher s Guide for AP Book.1 Unit 4 Operations and Algebraic Thinking E-4

2 The multiples of chart. Remind students that a chart can help them recall multiplication facts. Draw a chart with rows and columns and write in the position numbers in the top left corner, or use a chart from BLM Odd Multiple Charts. Skip count with students to fill in the multiples of. The finished chart should look like this: SAY: This chart can help us remember our multiplication facts for the number. The position number tells us what number to multiply by, and the number in the square tells us the answer. Exercises: 1. Use the multiples of chart to fill in the blanks. a) is in position, so =. b) is in position 5, so 5 =. c) is in position 6, so 6 =. d) is in position, so =. e) is in position 4, so 4 =. f) is in position, so =. Bonus: There is no 10 position in this chart, but we know that 10 =. Answers: a) 21, b) 15, c) 18, d), e) 12, f) 2, Bonus: 0 2. Use the multiples of chart to fill in the blanks. a) 24 is in position, so = 24. b) 18 is in position, so = 18. c) 12 is in position, so = 12. d) 21 is in position, so = 21. e) 2 is in position, so = 2. f) 15 is in position, so = 15. Answers: a) 8, b) 6, c) 4, d), e), f) 5. Circle the numbers that are multiples of. Above each multiple, write the position it has in the multiples of chart., 5, 6, 8,, 10, 11, 12, 14, 15, 16, 18, 1, 21, 22, 24, 25, 26, 2, 28, 0 Answers: 10, 5, 6, 8,, 10, 11, 12, 14, 15, 16, 18, 1, 21, 22, 24, 25, 26, 2, 28, 0 Practicing multiples of. Point to the multiples of chart on the board. ASK: What patterns do you see in the chart? What is the value of the tens in each row? (each multiple in the first row has 0 tens, the second row has 1 ten, and the third row has 2 tens) What do you get if you add the number in the tens position to the number in the ones position? (for each number in a E-48 Teacher s Guide for AP Book.1 Unit 4 Operations and Algebraic Thinking

4 Answers: a) = = 14, b) = = 56, c) = = 42, d) = 60 + = 6, e) = = 1, f) = = 84 Summarizing multiplication facts for. As a class, skip count by s from 0 to 0. Give each student a copy of BLM Skip Counting Chart. Skip count by s together while students fill in the first column. Have students complete the rest of the chart on their own. The completed chart should look like this: Skip Count by s Tens Ones Even or Odd? even 0 odd even odd even 5 5 odd even 4 4 odd even 6 6 odd 0 0 even ASK: Is there a pattern in the last column? (yes) What is the pattern? (the numbers alternate: even, odd, even, odd) Do you notice anything about the ones column? (the ones column contains all digits from 0 to ) The multiples of chart. Draw a chart with rows and columns and write the position numbers in the top left corner, or display a chart from BLM Odd Multiple Charts. Skip count with students to fill in the multiples of, as shown below: SAY: This chart can help us remember our multiplication facts for the number. ASK: Do you see any patterns in the chart? PROMPT: What patterns do you see in the first column? (the number in the ones place goes up by 1) What patterns do you see in the second and E-50 Teacher s Guide for AP Book.1 Unit 4 Operations and Algebraic Thinking

5 third columns? (the number in the ones place also goes up by 1) How do the digits in the tens place change as you go down a column? (they go up by 2) What pattern do you see in the ones place as you read across the rows? (the ones place goes down by ) What happens to the tens place as you go across a row? (the tens digits go up by 1) Exercises: 1. Use the multiples of chart to fill in the blanks. a) is in position, so =. b) is in position 5, so 5 =. c) is in position 6, so 6 =. d) is in position, so =. e) is in position 4, so 4 =. f) is in position, so =. Bonus: There is no 10 position in this chart, but we know that 10 =. Answers: a) 4, b) 5, c) 42, d) 21, e) 28, f) 6, Bonus: 0 2. Use the multiples of chart to fill in the blanks. a) 14 is in position, so = 14. b) 28 is in position, so = 28. c) 21 is in position, so = 21. d) 42 is in position, so = 42. e) 4 is in position, so = 4. f) 6 is in position, so = 6. Answers: a) 2, b) 4, c), d) 6, e), f). Circle the numbers that are multiples of. Above each multiple, write the position it has in the multiples of chart.,, 12, 14, 1, 21, 2, 28, 4, 5, 41, 42, 4, 4, 54, 56, 60, 6, 6, 0 Answers: 10,, 12, 14, 1, 21, 2, 28, 4, 5, 41, 42, 4, 4, 54, 56, 60, 6, 6, 0 Using a chart from BLM Odd Multiple Charts, have students fill in the first row by skip counting by s. Ask students to fill in the remaining rows using the patterns discussed in class, skip counting, or another strategy. Students should practice filling in charts from BLM Odd Multiple Charts until they can fill in the whole chart for multiples of on their own. Students who master the table quickly could fill in a new chart starting at in position 11 (remember to change the position numbers so that they start from 11). Play What number is hidden? (see Introduction) Have students play the game using the completed multiples of chart. Practice with multiples of odd numbers. Give each student a copy of BLM Odd Multiples. SAY: Complete the multiplication questions on this sheet. You can use skip counting, repeated addition, patterns, or your memory. Check your answers by using a different strategy. (1. cross out 2, 4,, 10, 11, 1, 1, 2, 25, 28; 2. a), b) 6, c) 12, d) 15, e), f) 18, g) 0, h) 24, i) 21, j) 2, Bonus:, Bonus: 24;. cross out 1, 4, 6,, 14, 1, 21, 22, 26, 1, 44, 4, 48; 4. a) 5, b) 10, c) 20, d) 25, e) 15, f) 0, g) 50, h) 40, i) 5, j) 45, Bonus: 0, Bonus: 45; 5. cross out,, 12, 18, 25, 0, 6, 55, 61, 6; 6. a), b) 14, c) 5, d) 28, e) 21, f) 4, g) 0, h) 42, i) 56, j) 6, Bonus: 14, Bonus: 21) Teacher s Guide for AP Book.1 Unit 4 Operations and Algebraic Thinking E-51

6 Extensions (MP.) 1. Sue started at 0 and skip counted by s. All her numbers were odd. Did she skip count correctly? How do you know? Answer: No. When you skip count by s starting from 0, there are both even and odd numbers. 2. John started at 0 and skip counted by s or s. He did not say 2, but he did say 28. What was he skip counting by? Answer: He was skip counting by s (28 is a multiple of, 2 is a multiple of and not ).. Jen started at 0 and skip counted by s or s. She did not say 14, but she counted past it. What was she skip counting by? Answer: She was skip counting by s. She would have skip counted 0,, 6,, 12, 15, and on. 4. Alice started at 0 and skip counted by s, 5s, or s. She said the number 12 while she was skip counting. What was Alice skip counting by? Answer: She was skip counting by s. 12 is a multiple of, but not a multiple of 5 or. 5. Use repeated addition to find the multiples of. At each step, using your previous answer and breaking into smaller numbers can help. Examples: 1 = 2 = + = = = 18 = 18 + = = 2 4 = 2 + = = 6 Answer: multiples of : 0,, 18, 2, 6, 45, 54, 6, 2, 81, 0, 6. Fill in a chart on BLM Odd Multiple Charts with multiples of and describe any patterns you see. Answers: In each column, from row to row, the number in the tens place increases by. Across each row the ones digits decrease as the tens digits increase. The tens digit and the ones digit of each number add to. For example, 0 + =, =, + 2 =. E-52 Teacher s Guide for AP Book.1 Unit 4 Operations and Algebraic Thinking

7 NAME DATE Odd Multiple Charts COPYRIGHT 2014 JUMP MATH: TO BE COPIED. CC EDITION E-64 Blackline Master Operations and Algebraic Thinking Teacher s Guide for AP Book.1

8 NAME Skip Counting Chart DATE Skip Count by Tens Ones Even or Odd? COPYRIGHT 2014 JUMP MATH: TO BE COPIED. CC EDITION E-66 Blackline Master Operations and Algebraic Thinking Teacher s Guide for AP Book.1

9 NAME Odd Multiples DATE 1. Cross out the numbers that are not multiples of Complete the multiplication sentence. a) 1 = b) 2 = c) 4 = d) 5 = e) = f) 6 = g) 10 = h) 8 = i) = j) = BONUS 1 = BONUS 8 =. Cross out the numbers that are not multiples of Complete the multiplication sentence. a) 1 5 = b) 2 5 = c) 4 5 = d) 5 5 = e) 5 = f) 6 5 = g) 10 5 = h) 8 5 = i) 5 = j) 5 = BONUS 5 6 = BONUS 5 = 5. Cross out the numbers that are not multiples of COPYRIGHT 2014 JUMP MATH: TO BE COPIED. CC EDITION 6. Complete the multiplication sentence. a) 1 = b) 2 = c) 5 = d) 4 = e) = f) = g) 10 = h) 6 = i) 8 = j) = BONUS 2 = BONUS = Blackline Master Operations and Algebraic Thinking Teacher s Guide for AP Book.1 E-6

10 OA-2 Patterns in Multiplication of Odd Numbers You can write the multiples of in a chart with rows of squares. You can use the patterns in the chart to help remember the multiples of Describe any patterns you see in the chart above is in position 6 in the chart a) 12 is in position b) 2 is in position c) 6 is in position. a) 24 is in position b) 15 is in position c) 21 is in position 8 = 24 = 15 = 21 d) is in position e) 18 is in position f) is in position = = 18 = 4. Use the patterns in the chart to help remember the multiples of. Try each question without looking at the chart. a) 2 b) 4 c) 6 d) 1 e) 5. Fred saw 4 tricycles at a park. How many wheels did he see? f) COPYRIGHT 2014 JUMP MATH: NOT TO BE COPIED. CC EDITION 0 Operations and Algebraic Thinking -2

11 You can write the multiples of in a chart with rows of squares. You can use the patterns in the chart to help remember the multiples of Describe any patterns you see in the chart above is in position 4 in the chart a) is in position b) 56 is in position c) 4 is in position 8. a) 14 is in position b) 21 is in position c) 6 is in position = 14 = 21 = 6 d) 28 is in position e) 42 is in position f) 5 is in position = 28 = 42 = 5 COPYRIGHT 2014 JUMP MATH: NOT TO BE COPIED. CC EDITION. Use the patterns in the chart to help remember the multiples of. Try each question without looking at the chart. a) 6 b) 4 c) 5 d) 8 e) Write the multiples of in a chart with rows of squares. What patterns do you see? f) Operations and Algebraic Thinking -2 1

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