Add or subtract decimals by estimating

Which difference is about 10?

• 33.2 – 28.4

• 70.9 – 58.7

• 42.5 – 16.8

• 65.7 – 65.6

Estimate the sum.

69.9 + 22.1 =

Estimate the difference.

98 - 5.7 =

Tags

CCSS.5.NBT.A.4

CCSS.5.NBT.B.7

Estimate the sum.

9 + 1.2 =

Lina buys a hamburger for $2.96 and a milkshake for $4.06. She pays with a $20 bill. What is a reasonable estimate for how much change she should get back?

Tags

CCSS.5.NBT.A.4

CCSS.5.NBT.B.7

Rob hikes 2.89 miles every day for one week straight. At the end of the week, about how many miles did he hike in total?

Tags

CCSS.5.NBT.B.7

Which is the best estimate of 61.4 + 88.3?

• 100

• 140

• 150

• 200

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

428.1 + 186.5 + 210.62

Tags

CCSS.5.NBT.A.4

Estimate the sum.

78.5 + 51.2

Estimate the difference.

968.8 - 161

Tags

CCSS.5.NBT.A.4

CCSS.5.NBT.B.7