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Which number is missing: 17 + ? = 20

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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 recognize that 20 - 13 = 7 or 20 - 7 = 13.


Which number is missing: 17 + ? = 20





 
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