Estimating Sums and Differences

Estimate the sum of 48 and 32 by rounding each number to the nearest ten.

• 100

• 70

• 80

• 90

Estimate the difference between 75 and 42 by rounding each number to the nearest ten.

• 60

• 30

• 40

• 50

Estimate the sum of 67 and 89 using compatible numbers.

• 170

• 180

• 160

• 150

Estimate the difference between 105 and 78 using compatible numbers.

• 10

• 50

• 20

• 30

Estimate the sum of 123 and 456 by rounding each number to the nearest hundred.

• 500

• 700

• 800

• 600

Estimate the difference between 789 and 321 by rounding each number to the nearest hundred.

• 400

• 600

• 700

• 500

Estimate the sum of 234 and 567 using compatible numbers.

• 700

• 900

• 800

• 1000

Estimate the difference between 876 and 543 using compatible numbers.

• 400

• 200

• 1000

• 600

Estimate the sum of 987 and 654 by rounding each number to the nearest thousand.

• 1500

• 2000

• 2500

• 1000

Estimate the difference between 8765 and 4321 by rounding each number to the nearest thousand.

• 4000

• 5000

• 6000

• 10000