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Unit 6, Lesson 17

Relate doubles to even numbers, and write number sentences to express the sums

EngageNY 60 min(s)

In this lesson, students arrange doubles into rectangular arrays (e.g., 2 rows of 7, or 2 sevens) and write an equation to show the total as a sum of two equal addends (e.g., 7 + 7 = 14). They discover that doubles yield even numbers even when the number being doubled is not even.

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Other lessons from Unit 6 in Grade 2 by EngageNY

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Unit 6, Lesson 16

Use grid paper to create designs to develop spatial structuring

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Unit 6, Lesson 18

Pair objects and skip-count to relate to even numbers

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Unit 6, Lesson 19

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Unit 6, Lesson 20

Use rectangular arrays to investigate odd and even numbers

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1 Content Standard is aligned with this lesson

2.OA.C.3

Major StandardsSupporting StandardsAdditional Standards

Standard 2.OA.C.3

Determine whether a group of objects (up to 20) has an odd or even number of members, e.g., by pairing objects or counting them by 2s; write an equation to express an even number as a sum of two equal addends.

Part of Supporting Cluster 2.OA.C

1 Math Practice Standard is aligned with this lesson

Standard MP.8

Look for and express regularity in repeated reasoning.

Prerequisites for 2.OA.C.3

1st Grade

1.OA.D.7

Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false. For example, which of the following equations are true and which are false? 6 = 6, 7 = 8 - 1, 5 + 2 = 2 + 5, 4 + 1 = 5 + 2.

Upcoming Standards for 2.OA.C.3

3rd Grade

3.OA.A.1

Interpret products of whole numbers, e.g., interpret 5 x 7 as the total number of objects in 5 groups of 7 objects each. For example, describe a context in which a total number of objects can be expressed as 5 x 7.

3.OA.D.9

Identify arithmetic patterns (including patterns in the addition table or multiplication table), and explain them using properties of operations. For example, observe that 4 times a number is always even, and explain why 4 times a number can be decomposed into two equal addends.

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