1, 2, 5, and 10.
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All the common multiples of a set of numbers are the multiples of their lowest common multiple: lcm(5, 8, 10) = 40 → first three common multiples are 40, 80, 120
20 pinkgal333:20, 40, 60 are all common multiples.
20, 40, 60, 80 and so on.
Well, honey, common multiples of 5 and 10 are numbers that both 5 and 10 can divide evenly into. So, grab your calculator and start counting by 10s until you hit a number that is also divisible by 5. Spoiler alert: the first few common multiples are 10, 20, 30, 40... you get the idea. Happy math-ing!
There is no upper limit to common multiples. LCM of 32 & 40 is 160...