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Unit 5, Lesson 19

Choose and explain solution strategies and record with a written addition or subtraction method

EngageNY 60 min(s)

In this lesson, students synthesize their understanding of addition and subtraction strategies to solve problems. They use that understanding to determine which of those strategies to apply to a variety of problems, including number-bond problems and problems with the unknown in all positions. Students then discuss and analyze their chosen methods and determine which method is most efficient for the given problem type.

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Other lessons from Unit 5 in Grade 2 by EngageNY

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Unit 5, Lesson 18

Apply and explain alternate methods for subtracting from multiples of 100 and from numb...

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Unit 5, Lesson 20

Choose and explain solution strategies and record with a written addition or subtractio...

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3 Content Standards are aligned with this lesson

2.NBT.B.7
2.NBT.B.8
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.3

Construct viable arguments and critique the reasoning of others.

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.