9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99, 108, 117, 126, 135
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The first three multiples of 3 are 3, 6, 9 The first three multiples of 9 are 9, 18, 27 As the lowest common multiples of 3 and 9 is 9, the common multiples of 3 and 9 are the multiples of 9, thus: The first three common multiples of 3 and 9 are 9, 18, 27
3+6+9...+45taking 3 common3(1+2+...+15) = 360
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
The first ten multiples of 3 are 3, 6, 9, 12, 15, 18, 21, 24, 27, and 30. Multiples are numbers that can be divided evenly by a given number, in this case, 3. Each subsequent multiple is found by adding 3 to the previous multiple.
3, 6, 9 4, 8, 12 5, 10, 15 Common multiples include 60, 120, and 180.