Multiply them together.
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LCD(7, 5, 10) = 10
Example: 1/30 and 1/42Their LCD is 210.Multiply each one by whatever it takes to make 210 in the denominator.30 x 7 = 21042 x 5 = 2101/30 x 7/7 = 7/2101/42 x 5/5 = 5/210
The LCD of 6, 5, and 7 is 210.
Example: 1/30 and 1/42Factor them.2 x 3 x 5 = 302 x 3 x 7 = 42Combine the factors, eliminating duplicates.2 x 3 x 5 x 7 = 210, the LCD