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!














If 9 subtracted from 16 leaves 7, then by adding the 9 back again, you should be back to where you started

If a group of 15 and a group of 8 are combined, taking one group away again should leave you with the other


Using an addition fact can help to solve a subtraction

16 + 14 gives a total of 30, not 20


20 + 10 would not give a total of 20

Addition can be done in any order


You can use addition to check a subtraction

Adding the two smaller numbers should give the larger number


If 62 + 38 = 100 is correct, then 100  38 should give an answer of 62

The inverse of subtraction is addition, the inverse of addition is subtraction
