15 = 3 x 5
25 = 5 x 5
LCM = 3 x 5 x 5 = 75
2/15 = 10/75
4/25 = 12/75
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The least common denominator is 60.
a least common (LCD) denominator is a least common multiple (LCM); only it's a fraction and it's LCM is in the denominator's place.
The least common denominator for 9 and 10 is 90.
The least common denominator of 13 and 52 is52
The Least Common Denominator of 57 and 35 is 1.