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what goes into both 21 and 25
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.
The smallest number that both 21 and 23 can go into is 483.
Put them both on similar terms: 21/25 = 63/75 while 13/15 = 65/75 So 13/15 is bigger.
It is 21 because 21/21 = 1 and 21/7 = 3