What is the sum of the first 3 common multiples of 8 and 9?
Multiples of 8: 8, 16, 24, 32, 40, 48, 56, 64, 72
Multiples of 9: 9, 18, 27, 36, 45, 54, 63, 72
First common multiple of 8 and 9: 72
Second common multiple of 8 and 9: 2 x 72 = 144
Third common multiple of 8 and 9: 3 x 72 = 216
First 3 common multiples of 8 and 9: 72, 144, 216
Sum of the first 3 common multiples of 8 and 9
= 72 + 144 + 216
= 432
Answer(s): 432