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- An array has 9 rows of 58 tiles. How many tiles are in the array?
- An array has 5 rows of 86 tiles. How many tiles are in the array? Explain a way to do this problem in your head.
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Ana solved 99 7.
Do you agree with Ana's solution? Tell Ana what you think of her solution.
- Choose one problem in Questions 1–8 that you solved using mental math and explain your thinking.
Use the Multiplication Strategies Menu and the Practicing Multiplication Strategies pages in your Student Activity Book for more 2-digit by 1-digit multiplication practice.