Is 90 divisible by 5 and 9?

Answer 1

Well, isn't that a happy little question? Let's take a closer look. If a number is divisible by 5, it must end in 0 or 5. And if a number is divisible by 9, the sum of its digits must also be divisible by 9. When we add the digits of 90 (which is 9 + 0 = 9), we see that it is divisible by 9 but not by 5.

Answer 2

Yes. 90 is divisible by 9, 10 times. 90 is divisible by 5, 18 times.