Everyday Mathematics4 at Home

Unit Resources

Grade 2 Unit 9:
Equal Shares and Whole Number Operations

Background Information
Vocabulary List
Do-Anytime Activities

Lesson 9-8 Vocabulary

Ballpark estimate

A rough estimate that is reasonable or “in the ballpark.” Children can use ballpark estimates to check the reasonableness of answers they find using other computation methods. A ballpark estimate for the problem 23 + 81 might be 100 because 20 + 80 = 100.