Least Common Multiple of 43 and 20

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

• Least Common Multiple of 43 and 20 by Prime method
• Least Common Multiple of 43 and 20 with GCF Formula

Least common multiple can be found by multiplying the highest exponent prime factors of 43 and 20. First we will calculate the prime factors of 43 and 20.

Prime Factorization of 43

Prime factors of 43 are 43. Prime factorization of 43 in exponential form is:

43 = 43¹

Prime Factorization of 20

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

20 = 2²×5¹

Now multiplying the highest exponent prime factors to calculate the LCM of 43 and 20.

LCM(43,20) = 2²×5¹×43¹
LCM(43,20) = 860

Factors of 43

List of positive integer factors of 43 that divides 43 without a remainder.

1, 43

Factors of 20

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

1, 2, 4, 5, 10, 20

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 43 and 20, than apply into the LCM equation.

GCF(43,20) = 1
LCM(43,20) = ( 43 × 20) / 1
LCM(43,20) = 860 / 1
LCM(43,20) = 860

(i) The LCM of 20 and 43 is associative

LCM of 43 and 20 = LCM of 20 and 43

1. What is the LCM of 43 and 20?

Answer: LCM of 43 and 20 is 860.

2. What are the Factors of 43?

Answer: Factors of 43 are 1, 43. There are 2 integers that are factors of 43. The greatest factor of 43 is 43.

3. 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.

4. How to Find the LCM of 43 and 20?

Answer:

Least Common Multiple of 43 and 20 = 860

Step 1: Find the prime factorization of 43

43 = 43

Step 2: Find the prime factorization of 20

20 = 2 x 2 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 = 860 = 2 x 2 x 5 x 43

Step 4: Therefore, the least common multiple of 43 and 20 is 860.