# Math Content by Strand 1

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1 Math Content by Strand 1 The Base-Ten Number System: Place Value Introduction 2 Learning about whole number computation must be closely connected to learning about the baseten number system. The base-ten number system is a place value system. That is, any numeral, say 2, can represent different values, depending on where it appears in a written number: it can represent 2 ones, 2 tens, 2 hundreds, 2 thousands, as well as 2 tenths, 2 hundredths, and so forth. Understanding our place value system requires coordinating the way we write the numerals that represent a particular number (e.g., 217) and the way we name numbers in words (e.g., two hundred seventeen) with how those symbols represent quantities. The heart of this work is relating the written numerals to the quantity and to how the quantity is composed. It builds from work on tens and ones in grades 1 and 2, to work on numbers in the 100s and 1,000s in grade 3, to work on numbers in the 1,000s to 10,000 in Grade 4, to a focus on 10,000s to 100,000 and beyond in Grade 5. This is not simply a matter of saying that 217 has two hundreds, 1 ten, and 7 ones, which we know students can easily learn to do as a pattern without much meaning attached to it. Students must learn to visualize how 217 is built up from hundreds, tens, and ones, in a way that helps them relate its value to other quantities. Understanding the place value of a number such as 217 entails knowing, for example, that 217 is closer to 200 than to 300, that it is 100 more than 117, that it is 17 more than 200, that it is 3 less than 220, and that it is composed of 21 tens and 7 ones. A thorough understanding of the base-ten number system is one of the critical building blocks for developing computational fluency. The composition of numbers from multiples of 1, 10, 100, 1000, and so forth, is the basis of most of the strategies students will adopt for whole number operations. First, the understanding of place value is at the heart of estimation. For example, consider adding two different quantities to 32: = = 1 This document applies to the 2nd edition of Investigations (2008, 2012). See for changes when implementing Investigations and the Common Core Standards. 2 Introduction excerpted from the Teacher Note, Computational Fluency and Place Value, Implementing Investigations in Grade (Kindergarten, 1, 2, 3, 4, and 5). 11/29/12, v1 TERC,

3 Students hear and use the counting sequence (the number names, in order) in a variety of contexts. Students engage in repeated practice with counting and develop visual images for quantities to 10. For example, work with Ten Frames helps students develop visual images of 10 and how that number is composed and decomposed. As students are developing accurate counting strategies they are also building an understanding of how the numbers in the counting sequence are related: Each number is one more (or one less) than the number before (or after) it. Students develop an understanding of the concepts of greater than, less than, and equal to, and develop language for describing quantitative comparisons (e.g. bigger, more, smaller, fewer, less, same, equal) as they count and compare quantities. Related Emphases Counting and Quantity Developing an understanding of the magnitude and position of numbers Developing strategies for accurately counting a set of objects by ones Related Benchmarks Count a set of up to 20 objects Figure out what is one more or one fewer than a number Grade 1 Because counting is the basis for understanding the number system and for almost all of the number work in the primary grades, first grade students work on developing strategies for accurately counting a group of up to 50 objects, both by ones and by numbers other than one (2s, 5s, and 10s). As students are developing accurate counting strategies they continue to build an understanding of how the numbers in the counting sequence are related each number is one more (or one less) than the number before (or after) it. 11/29/12, v1 TERC,

4 As students build this understanding, they compare and order quantities and develop a sense of the relative size of numbers and the quantities they represent. First grade students also focus on understanding the quantity 10, including how it is composed and its importance in grouping and keeping track of quantities. Students are expected to develop fluency with the combinations of 10 by the end of the school year. This work with the combinations of 10 also lays the foundation for exploring new ideas such as counting by 10s, the place value of the teen numbers (e.g., the teen numbers are made up of one group of ten and some number of 1s), and generating equivalent expressions for numbers under 20 (e.g., = ). Related Emphases Counting and Quantity Developing an understanding of the magnitude and position of numbers Developing strategies for accurately counting a set of objects by ones and groups Number Composition Composing Numbers up to 20 with two addends Computational Fluency Knowing addition combinations of 10 Related Benchmarks Interpret and solve problems about the number of tens and ones in a quantity Demonstrate fluency with the two-addend combinations of 10 Identify, read, write, and sequence numbers up to 105 Grade 2 At the beginning of the school year, students have varied opportunities to count sets of objects by ones, write the number sequence, and explore and compare representations of the counting numbers on the number line and the 100 chart. As the school year progresses, most second graders shift from thinking and working primarily with ones to thinking and working with groups of ones. To help them make this shift, students have many opportunities to develop strategies for grouping and for counting by groups. The focus is first on contexts that encourage counting by groups of 2, 5, or 10 and then specifically on groups of 10 and the base ten structure of our number system. In Grade 2, students work extensively with contexts and models that represent the place value structure of our base-ten number system. They use a sticker context where stickers come in singles, strips of 10, and sheets of /29/12, v1 TERC,

5 Sample Student Work They also work with money, focusing specifically on pennies, dimes, and dollars. They use these contexts to build and visualize how two-digit numbers are composed. For example, 33 cents can be composed of 3 dimes and 3 pennies or 2 dimes and 13 pennies or 1 dimes and 23 pennies. Students also work with other models, including the number line, 100 chart, and cubes organized into towers of ten. The purpose of these models is to help students build mental images that they can use in visualizing and solving problems. In Grade 2, students work with place value plays a foundational role in their development of strategies for adding and subtracting 2-digit numbers. Students use and understanding of the two strategies for addition, adding by place and adding one number in parts, and the strategy for subtraction of subtracting one number in parts, depend on an understanding of how to decompose numbers into tens and ones. Adding tens and ones = = = = 46 Adding on one number in parts = = = 46 11/29/12, v1 TERC,

6 Subtracting in parts = = = = = 14 Related Emphases The Base Ten Number System Understanding the equivalence of one group and the discrete units that comprise it Counting and Quantity Developing an understanding of the magnitude and sequence of numbers up to 100 Related Benchmarks Interpret and solve problems about the number of tens and ones in a quantity Demonstrate fluency with addition combinations to Count by 2s, 5s, and 10s, up to 110 Grade 3 In Grade 3, students build an understanding of the base-ten number system to 1,000 by using 100 grids to construct a class and individual 1,000 charts and by thinking about how 2- and 3-digit numbers relate to 1,000. Students use base-ten contexts (stickers arranged in sheets of 100, strips of 10, and singles and dollars, dimes, and pennies) to represent the place value of two-digit and three-digit numbers. Students identify the hundreds digit as representing how many 100s are in the number, the tens digit as representing how many 10s, and the ones digit as representing how many 1s. They also break numbers into 100s, 10s, and 1s in different ways. For example, the number 137 can be composed from 1 hundred, 3 tens, and 7 ones; 13 tens and 7 ones; 12 tens and 17 ones; 11 tens and 27 ones and so on. Decomposing numbers flexibly supports students work on developing computational fluency. The development of accurate and efficient computation strategies involves the ability to add multiples of 10 to and subtract them from any number. In Grade 3, students use the place value context of stickers arranged in sheets of 100, strips of 10, and singles to examine what happens when 10 or a multiple of 10 is added to or subtracted from a 2- or 3-digit number. They look at what happens to the digit in the ones place and explain why the value of this digit doesn t change. They extend this work as they add 100 to numbers; looking at what happens to the tens and ones digits and explaining why these digits remain the same. To deepen their understanding of place value and develop more efficiency in computation, students then extend this work to adding or subtracting multiples of 10 and 100 (i.e., 20, 50, 70, 200, 500, 700) to or from any number. They continue this work throughout the year in the Ten- Minute Math activity, Practicing Place Value. 11/29/12, v1 TERC,

8 of one number can help determine the multiples of a number that is double or half that number: how can a student use the known product of 10 x 8 to help solve 5 x 8? Related Emphases The Base Ten Number System Understanding the equivalence of one group and the discrete units that comprise it Extending knowledge of the number system to 1,000 Computational Fluency Adding and subtracting accurately and efficiently Learning the multiplication combinations with products to 50 fluently Whole Number Operations Developing strategies for division based on understanding the inverse relationship between multiplication and division Related Benchmarks Read, write, and sequence numbers to 1,000 Identify the value of each digit in a 3-digit number (100s, 10s, and 1s) Identify how many groups of 10 are in a 3-digit number (e.g. 153 has 15 groups of 10, plus 3 ones) Break up 3-digit numbers less than 200 into 100s, 10s, and 1s in different ways (e.g. 153 equals 1 hundred, 5 tens, and 3 ones; 15 tens and 3 ones; 14 tens and 13 ones, etc.)add multiples of 10 (up to 100) to and subtract them from 2-digit and small 3-digit numbers Add multiples of 10 and 100 (to 1,000) to and subtract them from any 3-digit number Solve addition problems with 3-digit numbers (to 400) using strategies that involve breaking numbers apart, either by place value or by adding one number in parts Solve multiplication combinations and related division problems by using skip counting or known combinations Grade 4 In Grade 4, students extend their knowledge of the base-ten number system, working with numbers up to 10,000. Their work focuses on understanding the structure of 10,000 and how numbers are related within that structure, recognizing the place value of digits in large numbers, and using place value to determine the magnitude of numbers. 11/29/12, v1 TERC,

9 In Grade 4, students extend and apply their understanding of place value and develop more efficiency in computation as they consider what happens when 100 and 1,000 and multiples of 100 and 1,000 are added to or subtracted from whole numbers. They consider what happens when they add these multiples as well as multiples of one tenth to decimal numbers (e.g., , , , , , , ). Students compare each sum or difference with the starting number and identify how the value of each place has or has not changed and why. Students practice these skills throughout the year in the Ten-Minute math activity, Practicing Place Value. In another variation of Practicing Place Value, students decompose numbers by place as they answer the question, How Many 10s? (100s?, 1,000s?) are in a given number. This goes beyond naming the number in each place; it includes understanding, for example, that while 335 is composed of 3 hundreds, 3 tens, and 5 ones, it can also be decomposed into 2 hundreds, 13 tens, and 5 ones, or 1 hundred, 23 tens, and 5 ones, or 33 tens and 5 ones. Decomposing numbers flexibly supports students continued work on developing computational fluency. In Grade 4, learning to multiply by 10 and multiples of 10 is a key component of the work on developing computational fluency in multiplication. Fourth graders consider what happens after a number is multiplied by 10 or 100. For example: 8 x 1 = 8 ones = 8 8 x 10 = 8 tens = 80 8 x 100 = 8 hundreds = x 1,000 = 8 thousands = 8,000 Through work with arrays and other representations, students come to understand that what they may describe as adding a zero actually represents the fact that each number is ten times greater than the previous number: or 80 (8 tens) is 10 times greater than 8 (8 ones), 800 (8 hundreds) is ten times greater than 80 (8 tens), etc. Students then extend this work as they use arrays and other representations to show situations involving multiplying by other multiples of 10, like 40, 60, or 90. This work helps them understand, for example, that the product of 3 x 40 is ten times the product of 3 x 4. Fourth grade students commonly use strategies to solve multiplication problems that involve breaking numbers apart by place. These strategies are based on an understanding of the effect of multiplying by multiples of 10. Breaking numbers apart by addition 48 x 42 = 48 x 42 = 40 x 40 = 1, x 40 = 1,920 11/29/12, v1 TERC,

11 explaining the results), students work with numbers to the ten thousands. This helps them develop reasonable estimates for sums and differences when solving problems with large numbers. Fifth graders also consider what happens when they add these multiples and multiples of tenths to decimal numbers (e.g., , , , , , , , ). Students compare each sum or difference with the starting number and identify how the value of the places has changed and why. Students practice these skills throughout the year in the Ten-Minute math activity, Practicing Place Value. In another variation of Practicing Place Value, students decompose numbers by place as they answer the question, How Many 10s? (100s?, 1,000s?) are in a given number. This goes beyond naming the number in each place; it includes understanding, for example, that while 9,435 is composed of 9 thousands, 4 hundreds, 3 tens, and 5 ones, it can also be decomposed as 8 thousand, 14 hundreds, 3 tens, and 5 ones or as 94 hundreds and 35 ones. Decomposing numbers flexibly supports students continued work on developing computational fluency. Students continue to consolidate and refine their multiplications strategies as they solve multiplication problems with 2- and 3-digit numbers. One common strategy involves breaking numbers apart by place. Students, efficient use of this strategy is dependent on their understanding of the effects of multiplying by 10 and multiples of 10. Breaking numbers apart by addition 148 x 42 = 148 x 42 = 40 x 100 = 4, x 42 = 4, x 40 = 1, x 40 = 1, x 8 = x 2 = 96 2 x 100 = 200 4, , = 6,216 2 x 40 = 80 2 x 8 = 16 4, , = 6,216 In Grade 5, students also refine their strategies for division. They solve division problems by relating them to missing factor problems (e.g., = and x 21 = 462), by building up groups of the divisor, and by using multiples of 10 to solve problems more efficiently. For example, when solving 1,280 32, some students start with 10 x 32 = 320, and keep adding ten groups of 32 until they reach 1,280. Students can learn to be more efficient: for example, once they know that 10 x 32 = 320, they can double that (20 x 32 = 640), and double it again (40 x 32 = 1,280) to find the answer. Related Emphases 11/29/12, v1 TERC,

12 The Base Ten Number System Extending knowledge of the number system to 100,000 and beyond Computational Fluency Adding and subtracting accurately and efficiently Solving Multiplication problems with 2- and 3-digit numbers Solving division problems with 2-digit divisors Whole Number Operations Understanding and using the relationship between multiplication and division to solve division problems Rational Numbers Understanding the meaning of decimal fractions Comparing decimal fractions Adding decimal fractions Related Benchmarks Read, write, and sequence numbers to 100,000 Solve multiplication problems efficiently Read, write, and interpret decimal fractions to thousandths Order decimals to the thousandths Add decimal fractions through reasoning about place value, equivalents, and representations Solve division problems efficiently 11/29/12, v1 TERC,

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