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A cup of tea costs 95p so how much does two cups cost?

Level 3-4 Numbers - Addition and Subtraction

Sharpen your addition and subtraction skills for KS3. Practise mental methods, column algorithms, and estimating to check answers. Tackle negatives, large numbers, and word problems with confidence.

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Fascinating Fact:

Mental maths strategies such as rounding and adjusting make adding and subtracting large numbers easier.

In KS3 Maths, you build fluency with addition and subtraction across integers and decimals. You’ll use mental strategies, written column methods, and sensible estimates to check answers and solve real-life problems quickly.

Key Terms

Sum: The result of adding numbers together (e.g., 37 + 15 has a sum of 52).
Difference: The result of subtracting one number from another (e.g., 52 − 15 = 37).
Estimate: A quick, sensible calculation (often by rounding) that checks if an exact answer is reasonable.

Frequently Asked Questions (Click to see answers)

What is the best method to add large numbers in KS3?

Use the column method: line up place values, add from the right, and carry digits where needed. Check with an estimate using rounded numbers.

How do I subtract with negative numbers?

Treat subtraction as adding the opposite: a − b = a + (−b). For example, 5 − 12 = 5 + (−12) = −7.

How can I check if my answer is reasonable?

Round the numbers to one or two significant figures and re-calculate. Your exact answer should be close to this estimate.

Try These Related Quizzes

1 .

What is 22 - 4 + 83?

100

101

102

22 - 4 = 18 and 18 + 83 = 101

2 .

What is 67 + 138 - 67?

120

128

130

138

67 appears twice: once as an addition and once as a subtraction. So they cancel each other out

3 .

What is twice the amount of 345?

690

700

710

720

345 + 345 = 690

4 .

What number must be added to 70 to make 120?

You can work this out by subtracting 70 from 120

5 .

What number must be subtracted from 1,200 to get 630?

570

575

650

675

570 is the difference between 630 and 1,200

6 .

Andy's Dad gives Andy 40p to buy a newspaper for him. The paper costs 25p. How much does Andy return to his Dad?

10p

15p

20p

40 - 25 = 15

7 .

Charlie decides to give his little sister 40p out of his £1.00 pocket money. How much does he have left?

20p

30p

50p

60p

60p + 40p = 100p which is equal to £1.00

8 .

Paula expects to get 15 Christmas cards. She receives 41. How many more did she get than expected?

41 - 15 = 26

9 .

What is 76 - 14?

To check you've got it right, add 14 to 62

10 .

What is 34 + 43?

3 + 4 = 7 so both columns in the sum are the same

You can find more about this topic by visiting BBC Bitesize - Positive and negative numbers

Author: Frank Evans (Specialist 11 Plus Teacher and Tutor)

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