Grade 1 Mathematics Module 1, Topic E

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Topic E leads students to a very intentional understanding and application of the equal sign and the commutative property of addition (1.OA.3 and 1.OA.7). Lessons 17 and 18 ask students to use pictorial representations (pictures and 5-groups) to write expressions, and demonstrate that they are equivalent by using the equal sign. This work with the equal sign precedes the lessons on commutativity in order to allow students to construct true number sentences such as 4 + 3 = 3 + 4 without misunderstanding the equal sign to mean that the numbers are the same. Students understand that when added together, two numbers make a the same total, regardless of whether one of the numbers appears first or second in equations and expressions. The topic ends with Lesson 20, where students directly apply their understanding of commutativity by starting with the larger quantity and counting on (a Level 2 strategy) as a matter of efficiency, “I can count on 2 from 7 when I solve 2 + 7!”

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Common Core Learning Standards

CCLS State Standard
1.OA.3 Apply properties of operations as strategies to add and subtract.3 Examples: If 8 + 3 = 11 is known...
1.OA.7 Understand the meaning of the equal sign, and determine if equations involving addition and...

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