Created By : Jatin Gogia
Reviewed By : Rajasekhar Valipishetty
Last Updated : Apr 06, 2023
Free LCM Calculator determines the least common multiple (LCM) between 65 and 68 the smallest integer that is 4420 that is divisible by both numbers.
Least Common Multiple (LCM) of 65 and 68 is 4420.
LCM(65,68) = 4420
Least common multiple or lowest common denominator (LCD) can be calculated in three ways;
Least common multiple can be found by multiplying the highest exponent prime factors of 65 and 68. First we will calculate the prime factors of 65 and 68.
Prime Factorization of 65
5 | 65 |
13 | 13 |
1 |
Prime factors of 65 are 5,13. Prime factorization of 65 in exponential form is:
65 = 51×131
Prime Factorization of 68
2 | 68 |
2 | 34 |
17 | 17 |
1 |
Prime factors of 68 are 2,17. Prime factorization of 68 in exponential form is:
68 = 22×171
Now multiplying the highest exponent prime factors to calculate the LCM of 65 and 68.
LCM(65,68) = 22×51×131×171
LCM(65,68) = 4420
Factors of 65
List of positive integer factors of 65 that divides 65 without a remainder.
1, 5, 13, 65
Factors of 68
List of positive integer factors of 68 that divides 68 without a remainder.
1, 2, 4, 17, 34, 68
The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 65 and 68, than apply into the LCM equation.
GCF(65,68) = 1
LCM(65,68) = ( 65 × 68) / 1
LCM(65,68) = 4420 / 1
LCM(65,68) = 4420
(i) The LCM of 68 and 65 is associative
LCM of 65 and 68 = LCM of 68 and 65
1. What is the LCM of 65 and 68?
Answer: LCM of 65 and 68 is 4420.
2. What are the Factors of 65?
Answer: Factors of 65 are 1, 5, 13, 65. There are 4 integers that are factors of 65. The greatest factor of 65 is 65.
3. What are the Factors of 68?
Answer: Factors of 68 are 1, 2, 4, 17, 34, 68. There are 6 integers that are factors of 68. The greatest factor of 68 is 68.
4. How to Find the LCM of 65 and 68?
Answer:
Least Common Multiple of 65 and 68 = 4420
Step 1: Find the prime factorization of 65
65 = 5 x 13
Step 2: Find the prime factorization of 68
68 = 2 x 2 x 17
Step 3: Multiply each factor the greater number of times it occurs in steps i) or ii) above to find the lcm:
LCM = 4420 = 2 x 2 x 5 x 13 x 17
Step 4: Therefore, the least common multiple of 65 and 68 is 4420.