LESSON 4 Addition Review

Mental Math Strategies

Jason and Rosa used mental math to solve 53 + 25.

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1. Explain Jason's strategy in your own words.
2. Explain Rosa's strategy in your own words.
3. Why do you think they chose to use mental math strategies instead of paper-and-pencil strategies to solve this problem?
4. Look carefully at these problems. Do not solve them yet, but instead talk with a partner. Can you use mental math to solve them or would you need paper and pencil to solve some?
   
   53 + 25          69 + 20          22 + 74

Use the Connect Addition Methods pages in the Student Activity Book to compare and connect paper and pencil methods to strategies involving base-ten pieces.