They're all multiples of 9.
45, 54, 63.
3
18, 27, 36, 45, 54, 63.
15, 30, 45, 60, 75, 90... 9, 18, 27, 36, 45, 54, 63...
They're all multiples of 9.
630 and all the multiples of 630.
90
630 and all its multiples.
18, 36, 54 and so on. 45, 90, 135 and so on. 63, 126, 189 and so n.
45 and 18
Any multiple of 630
45, 54, 63.
3
252
Multiples of 9 are 9, 18, 27, 36, 45, 54, 63, 72...
90