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Adding and Subtracting Decimals

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Adding and Subtracting Decimals

Practise estimating, adding and subtracting decimals to three decimal places. Line up decimal points and use inverse operations to check your calculations.

Estimate and calculate

1.Round 6.7 and 3.2 to the nearest whole number to estimate their sum. Then calculate 6.7 + 3.2 exactly.

2.A smoothie costs $4.65 and a toasted sandwich costs $8.40. Estimate the total by rounding each price to the nearest dollar, then find the exact total.

3.Calculate 18.3 − 9.76. Show how you align the decimal places.

4.At midday, the temperature was 17.35°C. By evening it had fallen by 4.8°C. What was the evening temperature?

More decimal challenges

5.Work out 31.486 + 7.9 + 0.275. Give your answer to three decimal places.

6.Freya cycles 4.65 km on Tuesday, 2.875 km on Thursday and 3.4 km on Saturday. What distance does she cycle altogether?

7.Georgia has $32.50. He spends $14.85 on a game and $6.75 on a snack. How much money remains?

8.Check the answer to the previous question using addition. Write an equation showing that the two amounts spent plus the money remaining equal Georgia’s starting amount.

9.Find the missing number: 23.406 − □ = 9.58.

10.A jug needs 3.25 litres of water for a mixture, but currently contains 2.4 litres. How much more water is needed? If 0.95 litres are then added, how much water is in the jug, and is that enough for the mixture?