# Excel LCM Function

The Excel LCM function returns the least common multiple of integers. The least common multiple is the smallest positive integer that is a multiple of all supplied numbers. For example, =LCM(25,40) returns 200.

**number1**- The first number.**number2**- [optional] The second number.

Use the LCM function when you want to calculate the least common multiple of integers. The least common multiple is the smallest positive integer that is a multiple of all of the numbers supplied as arguments. A common use of the LCM function is to add fractions that have different denominators.

For example, =LCM(3,4) returns 12, since 12 is the smallest multiple of both 3 and 4. However, =LCM(3,4,5) returns 60, since 60 is the smallest multiple of all three numbers.

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