Homework Explained - Math Practice 101

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Grade 3 Go Math Student- Answer Keys
Chapter 1 - Lesson 1.3 Mental Math Strategies for Addition


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On Your Own

Count by tens and ones to find the sum.

Use the number line to show your thinking.

Use mental math to find the sum.
Draw or describe the strategy you use.

  • Question 9 (request help)

    On Friday, 376 people attended the school concert.On Saturday, 427 people attended. Explain how can you use mental math to find how many people attended the concert.

  • 376 + 427 =   

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