Python Program to find the LCM of two numbers

Python Program to find the LCM of two numbers

Hello everyone, welcome back to Here I am going to tell a simple logic by which we can find the LCM of two numbers in python.

LCM means Least Common Multiple, for a given 2 numbers we need to find the least common multiple for them.

Let’s take an example of 3 and 5, here I will find the LCM of those 2 numbers.

Multiples of 3: 3, 6, 9, 12, 15, 18, 21, 24…

Multiples of 5: 5, 10, 15, 20, 25, 30….

Now we find the first number which is found in both the multiples and it is clear that 15 is that number, and the LCM(3, 5) will be 15.

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Program on Github

LCM of 2 numbers – Code Visualization


To find LCM of 2 numbers


  • Read two input numbers using input().
  • Find the minimum of 2 numbers, using min() function and store the value in numbers_min variable.
  • Now run a while loop and check whether both numbers are divisible by the numbers_min variable which we got in the previous step.
    • if both numbers are divisible by numbers_min print the value as LCM and break the loop
    • if not, increment numbers_min value and continue while loop.


__author__ = 'Avinash'

num1 = int(input("Enter first number: \t"))
num2 = int(input("Enter second number: \t"))

numbers_min = min(num1, num2)

if(numbers_min % num1 == 0 and numbers_min % num2 == 0):
print("LCM of two number is: ", numbers_min)
numbers_min += 1

Program on Github


LCM of 2 numbers -
LCM of 2 numbers –
LCM of 2 numbers -
LCM of 2 numbers –

Program on Github

That’s it for this post. Feel free to look at some of the algorithms implemented in python or some basic python programs or look at all the posts here.

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