Its easy from 9 u just keep on addding 9 e.g
9,18, 28,37.......................
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There are 5 multiples of 9. There are 4 multiples of 12. There is 1 number that is a multiple of both, 36.
918273645546372819099108117126135144153162171180189198207216225234243252261270279288297306
150 ÷ 9 = 16 r 6 → the first natural number between 150 and 300 divisible by 9 is 9 × 17 (=154)300 ÷ 9 = 33 r 3 → the last natural number between 150 and 300 divisible by 9 is 9 × 33 (=297)→ there are 33 - 17 + 1 = 17 natural numbers between 150 and 300 divisible by 9.
There are six: 9, 27, 45, 63, 81,99
9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99 so there is 11 multiples.