Least Common Multiple of 20 and 23

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

• Least Common Multiple of 20 and 23 by Prime method
• Least Common Multiple of 20 and 23 with GCF Formula

Least common multiple can be found by multiplying the highest exponent prime factors of 20 and 23. First we will calculate the prime factors of 20 and 23.

Prime Factorization of 20

Prime factors of 20 are 2,5. Prime factorization of 20 in exponential form is:

20 = 2²×5¹

Prime Factorization of 23

Prime factors of 23 are 23. Prime factorization of 23 in exponential form is:

23 = 23¹

Now multiplying the highest exponent prime factors to calculate the LCM of 20 and 23.

LCM(20,23) = 2²×5¹×23¹
LCM(20,23) = 460

Factors of 20

List of positive integer factors of 20 that divides 20 without a remainder.

1, 2, 4, 5, 10, 20

Factors of 23

List of positive integer factors of 23 that divides 23 without a remainder.

1, 23

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 20 and 23, than apply into the LCM equation.

GCF(20,23) = 1
LCM(20,23) = ( 20 × 23) / 1
LCM(20,23) = 460 / 1
LCM(20,23) = 460

(i) The LCM of 23 and 20 is associative

LCM of 20 and 23 = LCM of 23 and 20

1. What is the LCM of 20 and 23?

Answer: LCM of 20 and 23 is 460.

2. What are the Factors of 20?

Answer: Factors of 20 are 1, 2, 4, 5, 10, 20. There are 6 integers that are factors of 20. The greatest factor of 20 is 20.

3. What are the Factors of 23?

Answer: Factors of 23 are 1, 23. There are 2 integers that are factors of 23. The greatest factor of 23 is 23.

4. How to Find the LCM of 20 and 23?

Answer:

Least Common Multiple of 20 and 23 = 460

Step 1: Find the prime factorization of 20

20 = 2 x 2 x 5

Step 2: Find the prime factorization of 23

23 = 23

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

LCM = 460 = 2 x 2 x 5 x 23

Step 4: Therefore, the least common multiple of 20 and 23 is 460.