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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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