what goes into both 21 and 25
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The smallest number that both 21 and 23 can go into is 483.
10 = 2 x 525 = 5 x 510 and 25 both go into 5.
It is 21 because 21/21 = 1 and 21/7 = 3
3
The lowest number that both 15 and 25 go into is 75. 15 goes into 75 5 times, and 25 goes into 75 three times.