Estimating Sums and Differences

Which difference is about 10?

• 33.2 - 28.4

• 70.9 - 58.7

• 42.5 - 16.8

• 65.7 - 65.6

Tags

CCSS.5.NBT.B.7

Which is the BEST estimate for 61.4 + 88.3?

• 100

• 140

• 150

• 200

Tags

CCSS.5.NBT.A.4

CCSS.5.NBT.B.7

Estimate the following sum by first rounding each number to the nearest hundred.

428.1 + 186.5 + 210.62 = x

(a)  

Tags

CCSS.5.NBT.A.4

CCSS.5.NBT.B.7

A school is having a pizza party. Each pizza is cut into 12 slices. In this scenario, is it better to overestimate or underestimate when determining how much pizza to order?

• overestimate

• underestimate

Tags

CCSS.3.OA.A.3

Cody buys a baseball bat for $164.50. About how much does the bat cost if you round to the nearest ten?

• 165

• 150

• 160

• 170

Tags

CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

Cody buys a baseball glove for 37.25. About how much does the glove cost if we round to the nearest ten?

• 35

• 30

• 50

• 40

Tags

CCSS.5.NBT.A.4

Umberto buys a game for $7.89 and some batteries for $5.49. He pays with a $20 bill. Which is the best estimate of hw much change he should get?

• $5.00

• $7.00

• $13.00

• $17.00

Tags

CCSS.5.NBT.A.4

CCSS.5.NBT.B.7