For a number to end woth 0, the number

must have 2 & 5 as factors.

10=2×

100=2²×²

For a number to end with 5, the number must have as a factor

30=5×

3ⁿ×4^m= 3ⁿ×^2m

As we see from the above examples we can say that.

This number doesn't have 5 or 5 and 2 as its factors. Therefore the number can't end with 0 or .