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Unit 4, Lesson 11

Represent subtraction with and without the decomposition of 1 ten as 10 ones with manipulatives

EngageNY 60 min(s)

In this lesson, students continue to deepen their conceptual understanding of place-value strategies for subtraction. They use place-value disks on a place-value chart to subtract like-units, e.g., 76 - 43 is 7 tens - 4 tens and 6 ones - 3 ones. They practice modeling the standard subtraction algorithm within 100 and learn to decompose 1 ten for 10 ones. The use of manipulatives allows students to physically experience the renaming and understand the "why" behind decomposing a quantity.

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Other lessons from Unit 4 in Grade 2 by EngageNY

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Unit 4, Lesson 10

Use math drawings to represent the composition when adding a two-digit to a three-digit...

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Unit 4, Lesson 12

Relate manipulative representations to a written method

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2 Content Standards are aligned with this lesson

2.NBT.B.7
2.NBT.B.9

Major StandardsSupporting StandardsAdditional Standards

Standard 2.NBT.B.7

Add and subtract within 1000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method. Understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.

Part of Major Cluster 2.NBT.B

1 Math Practice Standard is aligned with this lesson

Standard MP.5

Use appropriate tools strategically.

Prerequisites for 2.NBT.B.7

2nd Grade

2.NBT.A.1

Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones; e.g., 706 equals 7 hundreds, 0 tens, and 6 ones. Understand the following as special cases:

2.NBT.A.1.A

100 can be thought of as a bundle of ten tens - called a "hundred."

2.NBT.A.1.B

The numbers 100, 200, 300, 400, 500, 600, 700, 800, 900 refer to one, two, three, four, five, six, seven, eight, or nine hundreds (and 0 tens and 0 ones).

Upcoming Standards for 2.NBT.B.7

2nd Grade

2.NBT.B.6

Add up to four two-digit numbers using strategies based on place value and properties of operations.

3rd Grade

3.NBT.A.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.