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Least Common Multiple of 6 and 15

Free LCM Calculator determines the least common multiple (LCM) between 6 and 15 the smallest integer that is 30 that is divisible by both numbers.

Least Common Multiple (LCM) of 6 and 15 is 30.

LCM(6,15) = 30

LCM of 6 and 15

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

LCM of:
and

Least Common Multiple (LCM) of 6 and 15 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 6 and 15. First we will calculate the prime factors of 6 and 15.

Prime Factorization of 6


2 6
3 3
1

Prime factors of 6 are 2,3. Prime factorization of 6 in exponential form is:

6 = 21×31

Prime Factorization of 15


3 15
5 5
1

Prime factors of 15 are 3,5. Prime factorization of 15 in exponential form is:

15 = 31×51

Now multiplying the highest exponent prime factors to calculate the LCM of 6 and 15.

LCM(6,15) = 21×31×51
LCM(6,15) = 30

Factors of 6

List of positive integer factors of 6 that divides 6 without a remainder.

1, 2, 3, 6

Factors of 15

List of positive integer factors of 15 that divides 15 without a remainder.

1, 3, 5, 15

Least Common Multiple of 6 and 15 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 6 and 15, than apply into the LCM equation.

GCF(6,15) = 3
LCM(6,15) = ( 6 × 15) / 3
LCM(6,15) = 90 / 3
LCM(6,15) = 30

Least Common Multiple of 6 and 15 by Listing Multiples

Multiples of 6

6, 12, 18, 24,30

Multiples of 15

15,30

Find the smallest number that is on all of the lists. We have it in bold above.

∴ Least Common Multiple of 6 and 15 is 30

Properties of LCM 6 and 15

(i) The LCM of 15 and 6 is associative

LCM of 6 and 15 = LCM of 15 and 6

Frequently Asked Questions on LCM of 6 and 15

1. What is the LCM of 6 and 15?

Answer: LCM of 6 and 15 is 30.

2. What are the Factors of 6?

Answer: Factors of 6 are 1, 2, 3, 6. There are 4 integers that are factors of 6. The greatest factor of 6 is 6.

3. What are the Factors of 15?

Answer: Factors of 15 are 1, 3, 5, 15. There are 4 integers that are factors of 15. The greatest factor of 15 is 15.

4. How to Find the LCM of 6 and 15?

Answer:

Least Common Multiple of 6 and 15 = 30

Step 1: Find the prime factorization of 6

6 = 2 x 3

Step 2: Find the prime factorization of 15

15 = 3 x 5

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

LCM = 30 = 2 x 3 x 5

Step 4: Therefore, the least common multiple of 6 and 15 is 30.