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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.
3 x 25 = 75 15 x 5 = 75 1 x 75 = 75 5 x 15 = 75
5 and 15 go into 60 & 75.
1, 3, 5 and 15
No. 15 has a factor of 3, so a common denominator (the smallest) for 15 and 25 would be 75. 15 goes into 75 five times, so 8/15 = 40/75. 25 goes into 75 three times, so 14/25 = 42/75. 40/75 < 42/75, therefore 8/15 < 14/25.