The list of numbers that are exactly divisible by 9 is infinite. The first four are: 9, 18, 27, 36 . . .
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Any number , where the digits sum to '9'.
e.g.
99 = 9 + 9 = 18 = 1 + 8 = 9
234 = 2 + 3 + 4 = 9
1134 = 1 + 1 + 3 + 4 = 9
et seq.,
Every number is divisible by 9 but the answer wont necessarily be a whole number.
If a number is not divisible by 3 then it is not divisible by 9.
999 is divisible by 9, but not by six; the next lower number divisible by 9 is 990, which is also divisible by 6, so that's the answer. Some shortcuts for divisibility: 0 is divisible by any number. If the last digit of a number is divisible by 2, the number itself is divisible by 2. If the sum of the digits of a number is divisible by 3, the number itself is divisible by 3. If the last TWO digits of a number are divisible by 4, the number itself is divisible by 4. If the last digit of a number is divisible by 5, the number itself is divisible by 5. If a number is divisible by both 2 and 3, it is divisible by 6. If the last THREE digits of a number are divisible by 8, the number itself is divisible by 8. If the sum of the digits of a number is divisible by 9, the number itself is divisible by 9. 990: 9+9+0=18, which is divisible by 9, so 990 is divisible by 9. 18 is also divisible by 3, so 990 is divisible by 3, and since 990 ends in 0 it's also divisible by 2, meaning that it's divisible by 6 as well.
20 is divisible by 2, 5 and 10. It is not exactly divisible by 3 or 9.
Not exactly because it will have a remainder