The multiples of 99 are infinite. They start with these and go on forever by continuously adding 99: 99, 198, 297, 396, 495, 594, 693 +99 . . .
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It is a requirement to list 33 multiples of some, as-yet-unspecified, number.
The common multiples of any two (or more) numbers are multiples of their lowest common multiple (lcm). lcm(9, 11) = 99 → first five common multiples are: 99, 198, 297, 396, 495
99 of them.
Multiples are formed by multiplying a number by successive counting numbers. The multiples of 9 are 9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99 and so on.
0. There are 9 multiples of 10 between 1 and 99, so 99 factorial is divisible by at least the 9th power of 10. Therefore the last 9 digits are 0.