Multiples of 9
Multiples of 9 are numbers that are divisible by 9. For example, 9, 18, 27, 36, 45, 54, 63, 72, 81, 90 are all multiples of 9. Multiples of 9 occur frequently in many mathematical problems and puzzles. For instance, the digits 1 through 9 add up to 45, which is a multiple of 9. … Read more