Question

42. Findd the HCF of 10, 15, 20.
(AX10
D1
​

Answer 1

10=5×2×1

15=5×1×3

20=5×2×2×1

hcf=5

Answer 2

Factors of 10 is =1,2,5

Factors of 15 is =1,3, 5

Factors of 20 is =1,2,2,5

Hence common factor is 5

So 5 is the hcf

By Euclid division algorithm

20=15*1+5

15=5*3+0

Hcf =5