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Lesson Plan

7. Understand the equals sign (C)

teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1
teaches Common Core State Standards CCSS.Math.Practice.MP2 http://corestandards.org/Math/Practice/MP2
teaches Common Core State Standards CCSS.Math.Content.1.OA.D.7 http://corestandards.org/Math/Content/1/OA/D/7
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Lesson objective: Understand that the equal sign means that there are two equivalent quantities on each side of the equal sign.

Students bring prior knowledge of decomposing numbers less than 10 from K.OA.A.3. This prior knowledge is extended to numbers through 20 as students look for multiple solutions where two addends equal 20. A conceptual challenge students may encounter is understanding that their solutions must total exactly 20. 

The concept is developed through work with a balance scale, which develops students' understanding of equality.

This work helps students deepen students' understanding of equivalence by requiring them to find multiple solutions to the same problem.

Students engage in Mathematical Practice 4 (model with mathematics) as they use balance scales to discover multiple ways to make a given total.

Key vocabulary:

  • balance
  • equal
  • scale

Special materials needed:

  • balance scale
  • counters
Related content

Appears in

Extending strategies for solving addition and subtraction problems

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