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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.

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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

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

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The product of the GCF and the LCM of two numbers is equal to the product of the original two numbers. Multiply the GCF and the LCM. The original two numbers will be another factor pair of that total. Find the factor pair that has that GCF and LCM.

Two or more numbers are needed to find the LCM

You need at least two numbers to find an LCM.

You need at least two numbers to find an LCM.

The GCF of two numbers multiplied by their LCM will equal the product of the original numbers. If you know the GCF, divide it into the product of the two. The result will be the LCM. If the GCF of two numbers is 1, the LCM is their product.

Related questions

Find the arithmetic average of the two rational numbers. It will be a rational number and will be between the two numbers.

You need at least two numbers to find an LCM.Two or more numbers are needed to find the Lcm

Two or more numbers are needed to find their LCM

Two or more numbers are needed to find their LCM

No. You can only find the LCM of at least two numbers, prime or otherwise. The LCM of any two prime numbers is their product.

The product of the GCF and the LCM of two numbers is equal to the product of the original two numbers. Multiply the GCF and the LCM. The original two numbers will be another factor pair of that total. Find the factor pair that has that GCF and LCM.

You need at least two numbers to find an LCM.

You need at least two numbers to find an LCM.

You need at least two numbers to find an LCM.

Two or more numbers are needed to find the LCM

Add them together and divide by 2 will give one of the rational numbers between two given rational numbers.

You need at least two numbers to find an LCM.