20, 40, 60, 80 and so on.
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20 pinkgal333:20, 40, 60 are all common multiples.
20
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!
Multiples of 2: 2, 4, 6, 8, 10, 12, 14, ... Multiples of 5: 5, 10, 15, 20, 25, 30, ... Multiples of 10: 10, 20, 30, 40, 50, ... So the LCM (Least Common Multiple) is 10.
Multiples of 4: 4, 8, 12, 16, 20 Multiples of 10: 10, 20 Therefore, the answer is 20. (: