5-2 Estimate Sums and Differences (Decimals)

Round to the nearest ones and then subtract.

$3.85 - $2.17

• $6

• $1

• $4

• $2

Round to the ones and then subtract.

52.85 - 9.09

• 44

• 45

• 43

• 40

Round to the nearest ones and then add.

19.83 + 9.93

• 30

• 31

• 29

• 35

Round to the nearest ones and then add.

3.872 + 2.409

• 5

• 7

• 6

• 4

Round to the nearest ones and then subtract.

9.086 - 2.419

• 8

• 7

• 6

• 5

The average speeds of two airplanes in miles per hour are: Hawekeye 375.52 and Foxbat 1,864.29. About how much faster is the Foxbat?

• 1, 490

• 1,486 mph

• 1,488 mph

• 1,487 mph

Aluminum and tin are both metals. The standard atomic weight for aluminum is 26.98. The standard atomic weight of tin is 118.71. Estimate the difference between the standard atomic weights of these two metals.

• 91

• 93

• 90

• 92

Lorena and her cousin are fishing at the lake. They caught two largemouth bass. One fish weighs 71.27 ounces and the other fish weighs 38.86 ounces. Estimate the total weight of the two fish.

• 110 ounces

• 109 ounces

• 111 ounces

• 115 ounces

The total lengths of four trails at a horseback riding camp were 2.6, 1.8, 4.2 and ?. The estimated length of all four trails is 12 miles. What is the possible length of the fourth trail.

• 5 miles

• 3 miles

• 2 miles

• 4 miles

Mr. Dixon bought a whiteboard that was on sale for $1,989.99. The regular price was $2,499.89. Select the true statement below.

• The sale price was about half the regular price.

• The regular price was about $1,000 more than the sale price.

• Mr. Dixon saved about $500.

• Mr. Dixon saved about $1,000.