Least Common Multiple of 21 and 34

Created By : Jatin Gogia

Reviewed By : Rajasekhar Valipishetty

Last Updated : Apr 06, 2023

Free LCM Calculator determines the least common multiple (LCM) between 21 and 34 the smallest integer that is 714 that is divisible by both numbers.

Least Common Multiple (LCM) of 21 and 34 is 714.

LCM(21,34) = 714

LCM of 21 and 34

Least common multiple or lowest common denominator (LCD) can be calculated in three ways;

LCM of:
and

Least Common Multiple of 21 and 34

LCM of 21 and 34 is 714

Least common multiple can be found by multiplying the highest exponent prime factors of 21 and 34. First we will calculate the prime factors of 21 and 34.

Prime Factorization of 21


3 21
7 7
1

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

21 = 31×71

Prime Factorization of 34


2 34
17 17
1

Prime factors of 34 are 2,17. Prime factorization of 34 in exponential form is:

34 = 21×171

Now multiplying the highest exponent prime factors to calculate the LCM of 21 and 34.

LCM(21,34) = 21×31×71×171
LCM(21,34) = 714

Factors of 21

List of positive integer factors of 21 that divides 21 without a remainder.

1, 3, 7, 21

Factors of 34

List of positive integer factors of 34 that divides 34 without a remainder.

1, 2, 17, 34

Least Common Multiple of 21 and 34 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21 and 34, than apply into the LCM equation.

GCF(21,34) = 1
LCM(21,34) = ( 21 × 34) / 1
LCM(21,34) = 714 / 1
LCM(21,34) = 714

Properties of LCM 21 and 34

(i) The LCM of 34 and 21 is associative

LCM of 21 and 34 = LCM of 34 and 21

Related Least Common Multiples of 21

Related Least Common Multiples of 34

Frequently Asked Questions on LCM of 21 and 34

1. What is the LCM of 21 and 34?

Answer: LCM of 21 and 34 is 714.

2. What are the Factors of 21?

Answer: Factors of 21 are 1, 3, 7, 21. There are 4 integers that are factors of 21. The greatest factor of 21 is 21.

3. What are the Factors of 34?

Answer: Factors of 34 are 1, 2, 17, 34. There are 4 integers that are factors of 34. The greatest factor of 34 is 34.

4. How to Find the LCM of 21 and 34?

Answer:

Least Common Multiple of 21 and 34 = 714

Step 1: Find the prime factorization of 21

21 = 3 x 7

Step 2: Find the prime factorization of 34

34 = 2 x 17

Step 3: Multiply each factor the greater number of times it occurs in steps i) or ii) above to find the lcm:

LCM = 714 = 2 x 3 x 7 x 17

Step 4: Therefore, the least common multiple of 21 and 34 is 714.