Just multiply 15 by 4 different whole numbers - in this case, by 1, 2, 3, and 4.
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The first four are; 4,8,12,16
15, 30, 45 and 60 are 4 multiples of 15
Sum of the first 15 positive integers is 15*(15+1)/2 = 120 Sum of the first 15 multiples of 8 is 8*120 = 960
5, 10, 15, 20
the first two common multiples of 15,27 are 135,270