The common multiples of 5 and 8 are the multiples of their lowest common multiple; lcm(5, 8) = 40
→ the first five common multiples of 5 and 8 are: 40, 80, 120, 160, 200.
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The first common multiple of 5 and 8 is 40 (5x8=40; 8x5=40).
What are the first three common multiples of four and five
8 and 9 are corpime, so their first common multiple is their product. The next common multiples are simply the multiples of that first multiple.The first three common multiples are therefore 72, 144 and 216.
The first five multiples of 4 are 4, 8, 12, 16 and 20. For them to be common, they need to be compared to another set of multiples.
Common multiples of a set of numbers are the multiples of their LCM. The next common multiple is the second multiple of LCM of 5 and 8. LCM of 5 and 8 is 40 and the second multiple of 40 is 80. So, the next common multiple is 80.