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Unit 5, Lesson 12

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

EngageNY 60 min(s)

In this lesson, students apply their knowledge of strategies to add numbers within 1,000. They are presented with a variety of problems for which they must choose an appropriate solution strategy. Students are encouraged to be flexible in their thinking and defend their reasoning using place-value language. They may choose to represent and solve problems using number bonds, arrow notation, place-value disks, or chip models.

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Other lessons from Unit 5 in Grade 2 by EngageNY

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Unit 5, Lesson 11

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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.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.

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