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Find the prime factors for each number and multiply out the common ones:

eg HCF of 91 and 52?

91 = 7 x 13, 52 = 2 x 2 x 13. (Only) common factor is 13.

For 182 and 52:

182 = 2 x 7 x 13, 52 = 2 x 2 x 13. Common factors are 2 and 13 so HCF is 2 x 13 ie 26

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