The least common denominator is the least common multiple of the denominators. The least common multiple is the smallest number that is multiple of two or more numbers.
3: 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51, 54, 57, 60
4: 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60
5: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60
The LCD of 3, 4 and 5 is 60.
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