Estimating Sums and Differences

Front

What is estimating in math?

Back

Estimating is finding a number that is close enough to the right answer, often used to make calculations easier.

Front

How do you estimate a sum?

Back

To estimate a sum, round each number to the nearest ten and then add those rounded numbers.

Front

How do you estimate a difference?

Back

To estimate a difference, round each number to the nearest ten and then subtract the smaller rounded number from the larger one.

Front

Estimate the sum: 45 + 36 to the nearest 10.

Back

80

Front

Estimate the difference: 92 - 47 to the nearest 10.

Back

50

Front

What is the nearest ten of 89?

Back

90

Front

What is the nearest ten of 31?

Back

30

Front

Estimate the sum: 67 + 24 to the nearest 10.

Back

90

Front

Estimate the difference: 75 - 28 to the nearest 10.

Back

50

Front

What is the nearest ten of 63?

Back

60