Adding and Subtracting Decimals

John walked 15.687 kilometers during the two days he was at the fair. On the first day he walked 3.30 kilometers. How far did he walk the second day?

• 12.3 kilometers

• 3.3 kilometers

• 15.6 kilometers

• 12.387 kilometers

Olivia was trying to put some files on her flash drive. If she had one file that was 1.65 mb and another file that was 6.7 mb, what is their combined file size?

• 8.35 mb

• 7.35 mb

• 9.35 mb

• 10.35 mb

Billy ate a snack with 66.34 total calories. If the chips he ate were 31.74 calories, how many calories were in the rest of his snack?

• 34.60 calories

• 35.60 calories

• 36.60 calories

• 37.60 calories

Frank was weighing the amount of candy he received for Halloween. If he received 8.99 kg and his brother received 7.3 kg, how much candy did they get all together?

• 16.29 kg

• 15.99 kg

• 16.19 kg

• 15.89 kg

Cody was checking how much power his lights used. His first light by itself used 87.383 amps. When he turned on the second light, together they used 150.587 amps. How many amps did just the second light use?

• 63.2 amps

• 87.381 amps

• 150.58 amps

• 63.204 amps

Haley was measuring how much taller she got over two years. In the first year she grew 5.44 cm. In the second year she grew 10.9 cm. How much taller did she get altogether?

• 16.34 cm

• 15.34 cm

• 17.34 cm

• 14.34 cm

On Monday and Tuesday the lake received 11.22 inches of water. If it received 3.42 inches on Monday, how much did it receive on Tuesday?

• 7.80 inches

• 7.90 inches

• 8.00 inches

• 8.10 inches

Edward was making some brownies and cupcakes for his school fundraiser. If the brownies needed 1.17 cups of sugar and the cupcakes needed 1.2 cups, how much sugar would he need altogether?

• 2.37 cups

• 2.27 cups

• 2.47 cups

• 2.17 cups

Will and Carol were running a relay race. The race was 35.7 kilometers total. If Will ran 18.20 kilometers, how far did Carol run?

• 17.5 kilometers

• 17.3 kilometers

• 17.7 kilometers

• 17.2 kilometers

During a science experiment, Mary found the mass of two rocks to be 20.801 grams and 100.346 grams. What is the total mass of these two rocks?

• 121.1 grams

• 120.1 grams

• 121.147 grams

• 120.047 grams