The factors of 360 are:
1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 18, 20, 24, 30, 36, 40, 45, 60, 72, 90, 120, 180, 360
The factors of 945 are:
1, 3, 5, 7, 9, 15, 21, 27, 35, 45, 63, 105, 135, 189, 315, 945
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They are members of the infinite set of numbers of the form 945*k where k is an integer. Since the set is infinite, it is not possible to list them.
3 x 3 x 3 x 5 x 7
945 ÷ 15 = 63.
5 times 189 equals 945. You can tell 945 is composite because it ends in a 5. That means if you keep counting by 5's and you count 5 189 times, you should get 945!
15 goes into 945 63 times.