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Eight of them.
Multiples? There are an infinite amount. Factors on the other hand, there are: 1, 3, 7 and 21.
No, they are factors of 15. Factors go into numbers, numbers go into multiples.
The first five positive integer multiples of 90 are: 1 x 90 = 90 2 x 90 = 180 3 x 90 = 270 4 x 90 = 360 5 x 90 = 450
Any multiples of 30 have these three factors. Multiples of 30.