Question

Find the HCF & LCM of 140 and 156 using prime factorization method

Answer 1

Hi there ☺️

First, taking prime factorisation ;-

2|140
2|70
5|35
7|7
___
1

2|156
2|78
3|39
13|13
___
1

Now ,
$140 = {2}^{2} \times 5 \times 7 \\ 156 = {2}^{2} \times 13 \times 3$
LCM -. 2×2 ×5×7×13 ×3 =5460
HCF - 2×2 =4


Thanks 1!