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Unit 4, Lesson 23

Use number bonds to break apart three-digit minuends and subtract from the hundred

EngageNY 60 min(s)

In this lesson, students extend mental math strategies to subtract tens by using number bonds. They learn to decompose the minuend into 100 and another number. Then they subtract the subtrahend from 100 and add the difference to the other number that results from the decomposition.

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Other lessons from Unit 4 in Grade 2 by EngageNY

Previous Lesson

Unit 4, Lesson 22

Solve additions with up to four addends with totals within 200 with and without two com...

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Unit 4, Lesson 24

Use manipulatives to represent subtraction with decompositions of 1 hundred as 10 tens ...

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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.2

Reason abstractly and quantitatively.

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.

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