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First you need to split the numbers down into their prime factors:

20 = 2x2x5

16 = 2x2x2x2

The next step is to identify any common factors. In this case, both numbers have two 2s as prime factors. Multiply these together and you get:

2x2 = 4

Thus the HCF of 20 and 16 is 4.

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13y ago

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