KS1 Maths Quiz
15 - 5 = 10, so 10 + 5 = 15!

Year 2 Calculation - Addition to Check Subtraction

This quiz addresses the requirements of the National Curriculum KS1 Maths and Numeracy for children aged 6 and 7 in year 2. Specifically this quiz is aimed at the section dealing with counting on from any given number.

Recognising that addition is the inverse, or opposite, of subtraction is useful when it comes to checking answers. For example, realising that 13 - 8 = 5 could be checked by adding 8 + 5 to give 13 means that subtraction calculation answers can be accurately checked.

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1. Question 1

Why is 48 - 20 = 54 incorrect?
The answer to a subtraction cannot be larger than the number at the beginning!
2. Question 2

Which calculation could you use to check that 18 - 7 = 11 is correct?
Adding the two smaller numbers should total the larger number
3. Question 3

Which calculation shows that this subtraction is correct?
78 - 40 = 38
Adding 4 groups of 10 to 38 gives the starting number of 78
4. Question 4

Check 67 - 25 = 42 with addition. Is this calculation correct?
The two smaller numbers add to give 67
5. Question 5

Which calculation could you use to check that 23 - 6 = 17 is correct?
If adding the two smaller numbers does not give the larger number as their total, something has gone wrong!
6. Question 6

Check 84 - 21 = 73 with addition. Is this calculation correct?
The two smaller numbers do not add to give the larger number, so the original calculation is incorrect
7. Question 7

How could you check that 24 - 8 = 16?
Adding the two smaller numbers should give the larger one
8. Question 8

Why is 33 - 20 = 13 true?
If you had 33 pennies and took 20 away (leaving 13), putting them all back again (13 + 20) would result in 33 pennies again
9. Question 9

Which calculation proves this calculation is incorrect?
62 - 19 = 55
The two smaller numbers do not add to total the larger one
10. Question 10

Which calculation proves this calculation is incorrect?
76 - 34 = 45
The two smaller numbers do not add to total the larger one

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