Can 300 over 399 be simplified?

Answer 1

Yes. Because both 300 and 399 are multiples of 3, the fraction 300/399 can be reduced to 100/133.

To quickly check for divisibility by 3, simply add up the digits of the number. If the result is divisible by 3, so is the original number. For example, 399 is divisible by 3 because 3 + 9 + 9 = 21 which is divisible by 3.