Question

use Prime factorisation to find the h.c.f of thefollowing
91,175,49
66,30

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Answer 1

Firstly we write down the prime factorization of all the 3

91= 7*13

175=5^2*7

49=7*7

Now we take the common numbers to the least powers

So it's 7, the hcf of 1 st one

Second on now

66=2*3*11

30=2*3*5

So number common is 2 and 3

So the HCF is 6