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.
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You can find more about this topic by visiting BBC Bitesize - Fact families - addition facts
You would also know that 20 - 6 = 14
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Adding the two smaller numbers in any order gives the larger number
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For the subtraction facts, the largest number should be at the beginning
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17 + 3 = 20 and so 3 + 17 = 20 also
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11 - 20 gives a negative answer of -9!
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All the others add up to different numbers
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20 - 18 = 2 is the other subtraction fact for these numbers
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16 + 5 = 21
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16 + 5 = 21, not 20 so all the other facts must be incorrect too
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14 + 4 = 18, so all the other facts must be incorrect too
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