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 knowing number facts to 20.
Knowing addition and subtraction facts (or number facts) to 20 by heart means being able to quickly know the pairs of numbers which make a total of twenty, as well as the associated subtraction facts. For example, if you know that 13 + 7 = 20, then you should also recognise that 20  13 = 7 or 20  7 = 13.














You would also know that 20  6 = 14

Adding the two smaller numbers in any order gives the larger number


For the subtraction facts, the largest number should be at the beginning

17 + 3 = 20 and so 3 + 17 = 20 also


11  20 gives a negative answer of 9!

All the others add up to different numbers


20  18 = 2 is the other subtraction fact for these numbers

16 + 5 = 21


16 + 5 = 21, not 20 so all the other facts must be incorrect too

14 + 4 = 18, so all the other facts must be incorrect too
