Question

19 Work out the highest common factor (HCF) of 75 and 105

Answer 1

The Greatest Common Factor (GCF) for 75 and 105, notation CGF(75,105), is 15. Explanation: The factors of 75 are 1,3,5,15,25,75; The factors of 105 are 1,3,5,7,15,21,35,105.

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Answer 2

The highest common factor is 15