Least Common Multiple of 7 and 13

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

• Least Common Multiple of 7 and 13 by Prime method
• Least Common Multiple of 7 and 13 with GCF Formula

Least common multiple can be found by multiplying the highest exponent prime factors of 7 and 13. First we will calculate the prime factors of 7 and 13.

Prime Factorization of 7

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

7 = 7¹

Prime Factorization of 13

Prime factors of 13 are 13. Prime factorization of 13 in exponential form is:

13 = 13¹

Now multiplying the highest exponent prime factors to calculate the LCM of 7 and 13.

LCM(7,13) = 7¹×13¹
LCM(7,13) = 91

Factors of 7

List of positive integer factors of 7 that divides 7 without a remainder.

1, 7

Factors of 13

List of positive integer factors of 13 that divides 13 without a remainder.

1, 13

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 7 and 13, than apply into the LCM equation.

GCF(7,13) = 1
LCM(7,13) = ( 7 × 13) / 1
LCM(7,13) = 91 / 1
LCM(7,13) = 91

(i) The LCM of 13 and 7 is associative

LCM of 7 and 13 = LCM of 13 and 7

1. What is the LCM of 7 and 13?

Answer: LCM of 7 and 13 is 91.

2. What are the Factors of 7?

Answer: Factors of 7 are 1, 7. There are 2 integers that are factors of 7. The greatest factor of 7 is 7.

3. What are the Factors of 13?

Answer: Factors of 13 are 1, 13. There are 2 integers that are factors of 13. The greatest factor of 13 is 13.

4. How to Find the LCM of 7 and 13?

Answer:

Least Common Multiple of 7 and 13 = 91

Step 1: Find the prime factorization of 7

7 = 7

Step 2: Find the prime factorization of 13

13 = 13

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

LCM = 91 = 7 x 13

Step 4: Therefore, the least common multiple of 7 and 13 is 91.