# 14. Practicing finding the sum of problems with four two-digit addends (FP)

teaches Common Core State Standards CCSS.Math.Content.2.NBT.B.6 http://corestandards.org/Math/Content/2/NBT/B/6
teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1
teaches Common Core State Standards CCSS.Math.Practice.MP8 http://corestandards.org/Math/Practice/MP8

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This lesson helps to build procedural skill with adding four two-digit addends. Students select the  addition strategies used here because they are applying known strategies to solve problems as they see appropriate. This work develops students' understanding that the sum of an addition problem remains the same no matter what strategy is used to solve it.

Students engage in Mathematical Practice 8 (Look for and express regularity in repeated reasoning) as they use strategies they have practiced in addition equations with two addends and apply them to equations with four addends.

Key vocabulary:

Special materials needed:

• 2 number cubes
• Recording Sheet
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