Question

What is the greatest number that divides $720$ and $810$ without leaving any remainder?

Answer 1

We have to find $H.c.f$ of $720and810$.

factors of 720$=$ $2\times 2\times 2\times 2\times 3\times 3\times 5$

and factors of 810$=$ $2\times 3\times 3\times 3\times 3\times 5$

So, $H.C.F$ of 810 and 720 $=$$2\times 3\times 3\times 5$$=$90

So , the required no. is 90.