Estimation

Front

What is estimation?

Back

Estimation is finding something close to the correct answer.

Front

Estimate the sum of 209 + 411.

Back

600

Front

Estimate 27 + 78.

Back

110

Front

Estimate 24 + 67.

Back

90

Front

What is the estimated sum of 69 + 12?

Back

80 (70 + 10).

Front

When estimating, what do we do?

Back

We round numbers to make them easier to add or subtract.

Front

What is the estimated sum of 50 + 30?

Back

80

Front

Estimate 45 + 36.

Back

80 (40 + 40).

Front

What is the estimated sum of 100 + 250?

Back

300.

Front

Estimate 15 + 29.

Back

40 (15 rounds to 20 and 29 rounds to 30).