Practice Estimating Involving Addition and Subtraction

Front

What is estimation in mathematics?

Back

Estimation is a method used to find an approximate value that is close to the actual value, often by rounding numbers.

Front

How do you round a number to the nearest hundred?

Back

To round a number to the nearest hundred, look at the tens digit. If it is 5 or more, round up; if it is 4 or less, round down.

Front

Estimate the answer to 456 + 345 by rounding to the nearest hundred.

Back

800

Front

What is the estimated difference when rounding 78 - 34 to the nearest ten?

Back

40

Front

Round the number 4,567 to the nearest hundred.

Back

4,600

Front

Estimate the sum of 234 + 678 by rounding to the nearest hundred.

Back

900

Front

What is the estimated total when adding 159, 129, 167, 93, and 119 by rounding to the nearest ten?

Back

670

Front

How do you round a number to the nearest ten?

Back

To round a number to the nearest ten, look at the ones digit. If it is 5 or more, round up; if it is 4 or less, round down.

Front

Estimate the sum of 345 + 678 by rounding to the nearest hundred.

Back

1000

Front

What is the estimated difference when rounding 85 - 27 to the nearest ten?

Back

60