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# How do you find 'LCM' of two rational numbers?

Updated: 9/17/2023

Wiki User

8y ago

Least common multiple is defined for integers, not for rational numbers. You can find the least common multiple of the denominators, though - they are integers, and this calculation is useful for adding or subtracting fractions.

Wiki User

14y ago

Wiki User

8y ago

Example: 30 and 42

Factor them.

2 x 3 x 5 = 30

2 x 3 x 7 = 42

Select the highest amount of each factor.

2 x 3 x 5 x 7 = 210, the LCM

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Q: How do you find 'LCM' of two rational numbers?
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