Question

Find the common factors of :

1. $15$ and $25$
   
2. $56$ and $120$
   
3. $8,12$ and $48$
   

Answer 1

$\left(1\right)$ $HCF$ of $15$ and $25$

$15=3\times 5$

$25=5\times 5$

So, $HCF=5$

$\left(2\right)$ $HCF$ of $56$ and $120$

$56=2\times 2\times 2\times 7$

$120=2\times 2\times 2\times \times 3\times 5$

So, $HCF=2\times 2\times 2=8$

$\left(3\right)$ $HCF$ of $8$,$12$ and $48$

$8=2\times 2\times 2$

$20=2\times 2\times 3$

$48=2\times 2\times 2\times 2\times 3$

So, $HCF=2\times 2=4$