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40 = 2 x 2 x 2 x 5
30 = 2 x 3 x 5
Least common denominator = 2 x 2 x 2 x 5 x 3 = 120
120
A common denominator, though not the least, is 40.
40
It is: 40
The least common denominator (LCD) is 40.
It is 80
200
360