Question

Write down all the factors of
(i) $20$
(ii) $36$
(iii) $60$
(iv) $75$

Answer 1

(i) $20$
$20=1\times 20$; $20=10\times 2$ and $20=4\times 5$
The factors of $20$ are $1,2,4,5,10$ and $20$.
(ii) $36$
$36=1\times 36$; $36=2\times 18$; $36=3\times 12$; $36=4\times 9$ and $36=6\times 6$
The factors of $36$ are $1,2,3,4,6,9,12$ and $36$.
(iii) $60$
$60=1\times 60$; $60=2\times 30$; $60=3\times 20$; $60=4\times 15$; $60=5\times 12$ and $60=6\times 10$
The factors of $60$ are $1,2,3,4,5,6,10,12,15$ and $60$.
(iv) $75$
$75=1\times 75$; $75=3\times 25$ and $75=5\times 15$
The factors of $75$ are $1,3,5,15,25$ and $75$.