Grade 5 · Math · Lesson 33

Estimation Challenge

Estimation is a fast way to find an answer that is close enough. Mathematicians, shoppers, and engineers all estimate every day. In this challenge lesson you will use rounding and front-end estimation to make smart predictions and check if exact answers make sense.

What this lesson teaches

1Round whole numbers to the nearest 10, 100, and 1,000
2Use front-end estimation to predict sums and differences
3Choose a sensible estimation strategy for a given problem
4Check whether a calculated answer is reasonable using estimation

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