There are 11 multiples of 9 less than 100. They are 9, 18, 27, 36, 45, 54, 63, 72, 81, 90 and 99.
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63
72
6 of them
infinite; positive are 9
Multiples of 9 less than 70 are: 9, 18, 27, 36, 45, 54, 63. So the greatest multiple of 9 that is less than 70 is 63.