Estimation

Overview

Your student will be learning:

rounding and using compatible numbers are ways to estimate sums and differences.

Example of compatible numbers:

279 + 128 is about 275 + 125.

These numbers add nicely: 75 + 25 = 100 and 200 + 100 = 300.

Finally, 100 + 300 = 400. So, an estimate for 279 + 128 is 400.

Resources

Your child will round numbers to the nearest 10 or 100 against the clock.

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