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LCM Formula

The Least Common Multiple of two integers a and b, usually denoted by LCM (a, b), is the smallest positive integer that is divisible by both a and b. In simple words, the smallest positive number that is a multiple of two or more numbers.

L.C.M formula for any two numbers is,

\[\large L.C.M=\frac{a\times b}{gcd\left(a,b\right)}\]

LCM formula for \fraction is given by,

\[\large L.C.M=\frac{L.C.M\;of\;Numerator}{H.C.F\;of\;Denominator}\]

The GCD or HCF is the greatest divisor which is divisible by both the numbers.

Solved Examples

Question 1: Find the LCM of (50, 65).


Given number is (50, 65).

The numbers can be written in the form of their prime factors-

50 = 1\times2\times5\times5

65 = 1\times5\times13

The greatest common factors (gcf) 0f (50,65) is 5.

Thus Least Common Multiple = \frac{50 \times 65}{5} = \frac{10}{65} = 65


The primes common to both are 2, 5, 5, 13 .
Hence, the LCM of (50, 65) = 2 $\times$ 5 $\times$ 5 $\times$ 13 = 650

LCM (50, 65) = 650

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