KS1 Maths Quiz
To check if 4 + 1 = 5 you could try seeing if 5 - 1 = 4 or 5 - 4 = 1.

# Year 2 Calculation - Inverse Operations

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 checking calculations using the inverse operation.

In order to check a calculation, it is useful to know the inverse (or opposite) operation. For example, the inverse operation of addition is subtraction so to check 5 + 6 = 11, you could try 11 - 6 = 5 or 11 - 5 = 6. Another way of checking an addition calculation would be to add the numbers up in a different order - this of course does not work for subtraction!

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1. Question 1

Use number pairs, or bonds, to 20 to find the incorrect calculation:
16 + 14 gives a total of 30, not 20
2. Question 2

Which calculation could you use to check that 15 + 8 = 23 is correct?
If a group of 15 and a group of 8 are combined, taking one group away again should leave you with the other
3. Question 3

How could you check 62 + 38 = 100?
If 62 + 38 = 100 is correct, then 100 - 38 should give an answer of 62
4. Question 4

How do you know that 20 - 10 = 10?
Using an addition fact can help to solve a subtraction
5. Question 5

If 29 - 15 = 14, what could you do to check the answer?
You can use addition to check a subtraction
6. Question 6

What does 'inverse operation' mean?
The inverse of subtraction is addition, the inverse of addition is subtraction
7. Question 7

How would you check 45 - 23 = 22?
Adding the two smaller numbers should give the larger number
8. Question 8

Use number pairs, or bonds, to 20 to find the incorrect calculation:
20 + 10 would not give a total of 20
9. Question 9

Which calculation could you use to check that 16 - 9 = 7 is correct?
If 9 subtracted from 16 leaves 7, then by adding the 9 back again, you should be back to where you started
10. Question 10

If 3 + 4 + 10 + 3 = 20, what could you do to check the answer?
Addition can be done in any order

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