Question

Determine the smallest number that should be added to 1225 to make it divisible by 10.
$\left[2\right]$

Answer 1

A number is divisible by 10 if it has 0 in its ones place.

The ones digit of 1225 is 5.

After 1225, the smallest possible number that ends with zero is 1230.
$\left[1.5\right]$

Let $x$ be the number that is added to 1225 to make it 1230 so that it is divisible by 10.
1225 + $x$ = 1230
$\Rightarrow x$ = 1230 - 1225
$\Rightarrow x$ = 5
Therefore, 5 should be added to 1225 to make it divisible by 10.
$\left[1.5\right]$