Least Common Multiple of 15 and 17

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

• Least Common Multiple of 15 and 17 by Prime method
• Least Common Multiple of 15 and 17 with GCF Formula

Least common multiple can be found by multiplying the highest exponent prime factors of 15 and 17. First we will calculate the prime factors of 15 and 17.

Prime Factorization of 15

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

15 = 3¹×5¹

Prime Factorization of 17

Prime factors of 17 are 17. Prime factorization of 17 in exponential form is:

17 = 17¹

Now multiplying the highest exponent prime factors to calculate the LCM of 15 and 17.

LCM(15,17) = 3¹×5¹×17¹
LCM(15,17) = 255

Factors of 15

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

1, 3, 5, 15

Factors of 17

List of positive integer factors of 17 that divides 17 without a remainder.

1, 17

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 15 and 17, than apply into the LCM equation.

GCF(15,17) = 1
LCM(15,17) = ( 15 × 17) / 1
LCM(15,17) = 255 / 1
LCM(15,17) = 255

(i) The LCM of 17 and 15 is associative

LCM of 15 and 17 = LCM of 17 and 15

1. What is the LCM of 15 and 17?

Answer: LCM of 15 and 17 is 255.

2. 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.

3. What are the Factors of 17?

Answer: Factors of 17 are 1, 17. There are 2 integers that are factors of 17. The greatest factor of 17 is 17.

4. How to Find the LCM of 15 and 17?

Answer:

Least Common Multiple of 15 and 17 = 255

Step 1: Find the prime factorization of 15

15 = 3 x 5

Step 2: Find the prime factorization of 17

17 = 17

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

LCM = 255 = 3 x 5 x 17

Step 4: Therefore, the least common multiple of 15 and 17 is 255.