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Asking what six multiples of fifteen are is the same as asking how many are in six groups of fifteen. To find this you need to multiply: 6X15= 90
1 2 3 5 6 9 10 15 18 30 45
141
-15
6 and 1
-5 and -10
15
30, 60, 90.
-11
30 = 1 x 30, 2 x 15, 3 x 10, 5 x 6
6*6=36
1x6 2x3
4 and 11.