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Maths Quiz - Level 3-4 Numbers - Decimals - Adding and Subtracting (Questions)

Add and subtract decimals with confidence. Line up decimal points, use place value, and estimate answers to check your calculations in real-life problems.

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Fascinating Fact:

Subtracting decimals helps compare distances, like finding that a 12.5 km journey is 2.3 km longer than a 10.2 km one.

In KS3 Maths, you practise adding and subtracting decimals using place value. Align decimal points in columns, add zeros if needed, calculate carefully, then check by estimating or using the inverse operation.

Key Terms

  • Decimal point: The dot that separates whole numbers from fractional parts, as in 7.46.
  • Place value: The value of a digit based on its position, for example tenths, hundredths, thousandths.
  • Column method: A written layout that lines up digits in the same place value to add or subtract.

Frequently Asked Questions (Click to see answers)

How do you add and subtract decimals correctly?

Write the numbers in columns and line up the decimal points. Add zeros to empty places, calculate from right to left, then place the decimal point in the answer directly below the others.

What are common mistakes with decimal subtraction?

Misaligning decimal points, forgetting to add placeholder zeros, and borrowing across the decimal point incorrectly. Always check alignment and consider estimating to see if the result is sensible.

How can I estimate a decimal answer quickly?

Round each number to one decimal place or to a convenient whole number, then add or subtract mentally. Use this estimate to check the accuracy of your exact calculation.

Try These Related Quizzes

1. What is 0.5 + 1.8?
[ ] 2
[ ] 2.1
[ ] 2.2
[ ] 2.3
2. What is 0.5 + 1.18?
[ ] 1.23
[ ] 1.58
[ ] 1.68
[ ] 2.32
3. What is 75.3 - 3.18?
[ ] 72.12
[ ] 71.9
[ ] 71.7
[ ] 71.2
4. George and Jake pay £4.25 each for a ticket to the circus. How much did they hand over?
[ ] £8.25
[ ] £8.40
[ ] £8.50
[ ] £8.75
5. A pint of milk costs 76p. However, if you buy 3 pints of milk, you only pay for 2. How much is 3 pints of milk?
[ ] 76p
[ ] £1.52
[ ] £2.28
[ ] £2.75
6. A greyhound runs an average of 37.5mph. A hare runs an average of 44.7mph. How much faster can the hare run?
[ ] 5.2
[ ] 6.2
[ ] 7.2
[ ] 8.2
7. What is 37.89 + 24.11 - 18.09?
[ ] 43.91
[ ] 47.14
[ ] 48.93
[ ] 52.25
8. What is 783.76 - 2.13?
[ ] 78.3
[ ] 76.23
[ ] 761.15
[ ] 781.63
9. Mick's test's results for the week are 4.8, 6.6 and 9.4. What is his total?
[ ] 18.8
[ ] 20.8
[ ] 22.8
[ ] 24.6
10. What is 22.7 - 4.13 + 0.008?
[ ] 17.76
[ ] 18.441
[ ] 18.5
[ ] 18.578

You can find more about this topic by visiting BBC Bitesize - How to add and subtract decimals

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Maths Quiz - Level 3-4 Numbers - Decimals - Adding and Subtracting (Answers)
1. What is 0.5 + 1.8?
[ ] 2
[ ] 2.1
[ ] 2.2
[x] 2.3
This is similar to 5 + 18 = 23. Just remember to replace the decimal point!
2. What is 0.5 + 1.18?
[ ] 1.23
[ ] 1.58
[x] 1.68
[ ] 2.32
Remember to use zeros - 0.50
3. What is 75.3 - 3.18?
[x] 72.12
[ ] 71.9
[ ] 71.7
[ ] 71.2
Remember to put a 0 after 75.3 if you're doing this calculation on paper
4. George and Jake pay £4.25 each for a ticket to the circus. How much did they hand over?
[ ] £8.25
[ ] £8.40
[x] £8.50
[ ] £8.75
£4.25 + £4.25
5. A pint of milk costs 76p. However, if you buy 3 pints of milk, you only pay for 2. How much is 3 pints of milk?
[ ] 76p
[x] £1.52
[ ] £2.28
[ ] £2.75
76p = £0.76. 0.76 + 0.76 = £1.52
6. A greyhound runs an average of 37.5mph. A hare runs an average of 44.7mph. How much faster can the hare run?
[ ] 5.2
[ ] 6.2
[x] 7.2
[ ] 8.2
44.7 - 37.5 = 7.2. To check you have the correct answer, you can also write 37.5 + 7.2 = 44.7
7. What is 37.89 + 24.11 - 18.09?
[x] 43.91
[ ] 47.14
[ ] 48.93
[ ] 52.25
All the numbers have 2 numbers after the decimal point so there's no need to add any 0s this time
8. What is 783.76 - 2.13?
[ ] 78.3
[ ] 76.23
[ ] 761.15
[x] 781.63
Line up the decimal points and use zeros!
9. Mick's test's results for the week are 4.8, 6.6 and 9.4. What is his total?
[ ] 18.8
[x] 20.8
[ ] 22.8
[ ] 24.6
4 + 6 + 9 = 19 and 0.8 + 0.6 + 0.4 = 1.8. 1.8 + 19 = 20.8
10. What is 22.7 - 4.13 + 0.008?
[ ] 17.76
[ ] 18.441
[ ] 18.5
[x] 18.578
If the numbers are different lengths, remember to line up the decimal points
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