# LCM of 7 and 21 Calculator

LCM Calculator computes the LCM of two numbers i.e. 7 and 21 and gives the Least Common Multiple 21 the smallest integer that is divisible by both the numbers.

Least Common Multiple of 7 and 21 is 21

LCM(7, 21) = 21

Ex: number 1 - 1500 and number 2 - 20.

LCM of
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## Finding LCM of two numbers 7 and 21 using Prime Factorization Method

Check out the procedure to find the Least Common Multiple of 7 and 21 using the Prime Factorization Method. They are as follows

Step 1: Firstly, find the Prime Factorization of given numbers 7, 21

Prime Factorization of 7 is as such

 7 7 1

Prime factors of 7 are 7. Prime factorization of 7 in exponent form is:

7 = 71

Prime Factorization of 21 is as follows

 3 21 7 7 1

Prime factors of 21 are 3,7. Prime factorization of 21 in exponent form is:

21 = 31×71

Step 2: Multiply together each of the Prime Numbers with the highest power to obtain the Least Common Multiple

On doing so, you will get the resultant equation as 31×71= 21

Therefore, LCM of two numbers 7 and 21 is 21

LCM(7,21) = 21

### Finding LCM of two numbers 7 and 21 using GCF Formula

Go through the simple and easy steps listed to know the Least Common Multiple of 7, 21 using the GCF Formula

Step 1: Find the Greatest Common Factor of 7, 21 initially.

Greatest Common Factor is the largest integer by which both the numbers can be divided. The GCF of 7, 21 is 7.

Simply use the GCF obtained in the formula to find the Least Common Multiple i.e. LCM(a,b) =a*b/GCF(a,b)

Substitute the inputs in the formula and you will get as under

LCM(7,21)= 7*21/GCF(7, 21)

= 7*21/7

= 21

Thus, LCM(7,21) using the GCF Formula is 21

### FAQs on LCM of two numbers 7, 21

1. What is the LCM of two numbers 7, 21?

LCM of two numbers 7, 21 is 21

2. How to find LCM of two numbers 7, 21 easily?

To find the LCM of two numbers 7, 21 take the help of LCM Calculator and get the result in a fraction of second.

3. Where do I get a detailed Procedure explaining the LCM of numbers 7, 21?

You can find a detailed Procedure explaining the LCM of numbers 7, 21 on our page.