Math Quiz Estimating Sums and Differences

Round each decimal to the nearest whole number. Then add or subtract.

$3.85 - $2.17

(a)  

Round each decimal to the nearest whole number. Then add or subtract.

52.85 - 9.09

(a)  

Round each decimal to the nearest whole number. Then add or subtract.

19.83 + 9.93

(a)  

Round each decimal to the nearest whole number. Then add or subtract.

3.872 + 2.409

(a)  

Round each decimal to the nearest whole number. Then add or subtract.

9.086 - 2.419

(a)  

An airplane named Hawkeye flies 375.52 mph. An airplane named Foxbat flies 1,864.29 mph. About how much faster is the Foxbat than the Hawkeye? Round the decimals to the nearest whole number.

(a)  

Aluminum and tin are both metals. The standard atomic weight for aluminum is 26.98. The standard atomic weight for tin is 118.71. Estimate the difference between the standard atomic weights of these two metals by rounding them to the nearest whole number.

(a)  

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 to the nearest whole number.

(a)  

The lengths for four horseback riding trails is shown below. Estimate the total length of all the trails by rounding to the nearest whole number.

Trail A = 2.6 miles

Trail B = 1.8 miles

Trail C = 4.2 miles

Trail D = 3.3 miles

(a)  

Mr. Dixon bought a whiteboard that was on sale for $1,989.99. The regular prices was $2,499.89. Which is the best estimate of the amount of money Mr. Dixon saved by buying the whiteboard on sale?

• $500

• $1,000

• $3,000

• $4,000

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CCSS.8.NS.A.2