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Unit 1, Lesson 18

Understand the meaning of the equal sign by pairing equivalent expressions and constructing true number sentences.

EngageNY 60 min(s)

In this lesson, students use pictorial representations (pictures and 5-groups) to evaluate whether equations are true or false. For example, they examine the false equation 4 + 2 = 5 + 3 and count on to determine that the totals on each side of the equation are not the same. Then they devise ways to change one side of the equation to make it true.

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Other lessons from Unit 1 in Grade 1 by EngageNY

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Unit 1, Lesson 17

Understand the meaning of the equal sign by pairing equivalent expressions and construc...

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Unit 1, Lesson 19

Represent the same story scenario with addends repositioned (the commutative property).

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1 Content Standard is aligned with this lesson

1.OA.D.7

Major StandardsSupporting StandardsAdditional Standards

Standard 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.

Part of Major Cluster 1.OA.D

Upcoming Standards for 1.OA.D.7

1st Grade

1.OA.D.8

Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = __ - 3, 6 + 6 = __.

2nd Grade

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.

2.OA.C.4

Use addition to find the total number of objects arranged in rectangular arrays with up to 5 rows and up to 5 columns; write an equation to express the total as a sum of equal addends.

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