Least Common Multiple of 11 and 18

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

• Least Common Multiple of 11 and 18 by Prime method
• Least Common Multiple of 11 and 18 with GCF Formula

Least common multiple can be found by multiplying the highest exponent prime factors of 11 and 18. First we will calculate the prime factors of 11 and 18.

Prime Factorization of 11

Prime factors of 11 are 11. Prime factorization of 11 in exponential form is:

11 = 11¹

Prime Factorization of 18

Prime factors of 18 are 2,3. Prime factorization of 18 in exponential form is:

18 = 2¹×3²

Now multiplying the highest exponent prime factors to calculate the LCM of 11 and 18.

LCM(11,18) = 2¹×3²×11¹
LCM(11,18) = 198

Factors of 11

List of positive integer factors of 11 that divides 11 without a remainder.

1, 11

Factors of 18

List of positive integer factors of 18 that divides 18 without a remainder.

1, 2, 3, 6, 9, 18

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 11 and 18, than apply into the LCM equation.

GCF(11,18) = 1
LCM(11,18) = ( 11 × 18) / 1
LCM(11,18) = 198 / 1
LCM(11,18) = 198

(i) The LCM of 18 and 11 is associative

LCM of 11 and 18 = LCM of 18 and 11

1. What is the LCM of 11 and 18?

Answer: LCM of 11 and 18 is 198.

2. What are the Factors of 11?

Answer: Factors of 11 are 1, 11. There are 2 integers that are factors of 11. The greatest factor of 11 is 11.

3. What are the Factors of 18?

Answer: Factors of 18 are 1, 2, 3, 6, 9, 18. There are 6 integers that are factors of 18. The greatest factor of 18 is 18.

4. How to Find the LCM of 11 and 18?

Answer:

Least Common Multiple of 11 and 18 = 198

Step 1: Find the prime factorization of 11

11 = 11

Step 2: Find the prime factorization of 18

18 = 2 x 3 x 3

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

LCM = 198 = 2 x 3 x 3 x 11

Step 4: Therefore, the least common multiple of 11 and 18 is 198.