Question

Determine if 25110 is divisible by 45.

Answer 1

Given number $25110$

It need to be divisile by both $5,9$ to make sure that it is divisible by $45$

Since the unit digit is $0$ it is divisible by $5$

The sum of digits is $2+5+1+1+0=9$ so it is divisible by $9$

Hence it is divisibel by $45$