Estimating the Sum of Decimals up to Two Decimal Places

Round decimals and estimate the sum. Compare the estimate to the precise sum in this activity.

Task 1

Putting It All Together

Answer these open ended questions on your own or with others to form deeper math connections.

Task 2

When would you round a number with a decimal to the benchmark values shown on the number line above?

Task 3

Why does rounding to these benchmark values make it easier to add decimals?