Question

Calculate HCF of 625 and 400

Answer 1

We can use prime factorisation here.

Prime factorisation of
625 = 5x5x5x5
400 = 2x2x2x2x5x5

So,
HCF = 2°x5²= 1x25= 25

Answer 2

5 625
5 125 hcf= 5
5 25
5 5
1
2 400
2 200 hcf=2
2 100
5 50
2 10
5