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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If 9 subtracted from 16 leaves 7, then by adding the 9 back again, you should be back to where you started
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If a group of 15 and a group of 8 are combined, taking one group away again should leave you with the other
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Using an addition fact can help to solve a subtraction
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16 + 14 gives a total of 30, not 20
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20 + 10 would not give a total of 20
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Addition can be done in any order
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You can use addition to check a subtraction
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Adding the two smaller numbers should give the larger number
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If 62 + 38 = 100 is correct, then 100 - 38 should give an answer of 62
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The inverse of subtraction is addition, the inverse of addition is subtraction
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