Rounding and Estimating Sums

Round 7 to the nearest ten.

• 0

• 10

• 70

• 15

Round 156 to the nearest hundred.

• 100

• 200

• 150

• 160

Round 209 to the nearest hundred.

• 100

• 200

• 300

• 250

ESTIMATE the sum.

456 -->

+823 -->

• 400 + 800 = 1,200

• 500 + 900 = 1,600

• 500 + 800 = 1,300

• 400 + 900 = 1, 300

ESTIMATE the sum.

123 -->

+498 -->

• 100 + 500 = 600

• 200 + 400 = 600

• 100 + 400 = 500

• 10 + 20 = 30

ESTIMATE the sum.

654-->

+879 -->

• 600 + 800 = 1,400

• 600 + 900= 1, 500

• 700 + 800 = 1, 500

• 700 + 900 = 1,600

Round 194 to the nearest ten.

• 100

• 200

• 190

• 210

237 fifth graders and 346 fourth graders went on a field trip. Estimate how many more fourth graders were on a field trip than fifth graders.

• 200 more

• 109 more

• 100 more

• 110 more

Use compatible numbers to estimate the value of 76 + 26.

• 75 + 25 = 100.

• 80 + 30 = 110

• 76 + 26 = 102

• 70 + 20 = 90

Round to the nearest thousand, then estimate the sum:

25,219 + 4,876

• 29,000

• 31,000

• 30,000

• 35,000