Created By : Jatin Gogia
Reviewed By : Rajasekhar Valipishetty
Last Updated : Apr 06, 2023
Free LCM Calculator determines the least common multiple (LCM) between 28 and 40 the smallest integer that is 280 that is divisible by both numbers.
Least Common Multiple (LCM) of 28 and 40 is 280.
LCM(28,40) = 280
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 28 and 40. First we will calculate the prime factors of 28 and 40.
Prime Factorization of 28
2 | 28 |
2 | 14 |
7 | 7 |
1 |
Prime factors of 28 are 2,7. Prime factorization of 28 in exponential form is:
28 = 22×71
Prime Factorization of 40
2 | 40 |
2 | 20 |
2 | 10 |
5 | 5 |
1 |
Prime factors of 40 are 2,5. Prime factorization of 40 in exponential form is:
40 = 23×51
Now multiplying the highest exponent prime factors to calculate the LCM of 28 and 40.
LCM(28,40) = 23×51×71
LCM(28,40) = 280
Factors of 28
List of positive integer factors of 28 that divides 28 without a remainder.
1, 2, 4, 7, 14, 28
Factors of 40
List of positive integer factors of 40 that divides 40 without a remainder.
1, 2, 4, 5, 8, 10, 20, 40
The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 28 and 40, than apply into the LCM equation.
GCF(28,40) = 4
LCM(28,40) = ( 28 × 40) / 4
LCM(28,40) = 1120 / 4
LCM(28,40) = 280
(i) The LCM of 40 and 28 is associative
LCM of 28 and 40 = LCM of 40 and 28
1. What is the LCM of 28 and 40?
Answer: LCM of 28 and 40 is 280.
2. What are the Factors of 28?
Answer: Factors of 28 are 1, 2, 4, 7, 14, 28. There are 6 integers that are factors of 28. The greatest factor of 28 is 28.
3. What are the Factors of 40?
Answer: Factors of 40 are 1, 2, 4, 5, 8, 10, 20, 40. There are 8 integers that are factors of 40. The greatest factor of 40 is 40.
4. How to Find the LCM of 28 and 40?
Answer:
Least Common Multiple of 28 and 40 = 280
Step 1: Find the prime factorization of 28
28 = 2 x 2 x 7
Step 2: Find the prime factorization of 40
40 = 2 x 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 = 280 = 2 x 2 x 2 x 5 x 7
Step 4: Therefore, the least common multiple of 28 and 40 is 280.