Given numbers are 45,20,639

The least common multiple of numbers can be find using the prime factorization method or LCM formula.

The LCM of 45,20,639 is 12780.

Find LCM of 45,20,639 with Prime Factorization

Multiply the prime numbers at the bottom and the left side.

3 x 3 x 5 x 1 x 4 x 71 = 12780

Therefore, the lowest common multiple of 45,20,639 is 12780.

LCM formula is LCM(a1, a2, an) = (a1 x a2 x an)/{GCF(a1 x a2 x an) x common factors}

Firstly, we have to find the product of all the numbers.

45 x 20 x 639 = 575100

Then, let us find the GCF of these five numbers. To do so, we have to list down the factors for each number and choose the highest factor that is in all of the lists.

45 : 1, 3, 5, 9, 15, 45

20 : 1, 2, 4, 5, 10, 20

639 : 1, 3, 9, 71, 213, 639

1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 45,20,639, is 1.

Now, the common factors can be found like this.

45:3x 3x 5

20:2x 2x 5

639:3x 3x 71

From this, we can see that the common factors because they appear for more than two numbers. So, just multiply them all together.

3x 3x 5 = 45

Therefore, the value for common factors is 45.

Now that we have all the elements of the formula, we can plug them in to calculate the LCM.

LCM(a1, a2, an) = (a1 x a2 x an)/{GCF(a1 x a2 x an) x common factors}

LCM = 575100/(1x45)

LCM = 575100/45

LCM = 12780

Thus, we can understand that the LCM of 45,20,639 is 12780.

Here are some samples of LCM of two or more Numbers calculations.

• LCM of 10, 48, 380
• LCM of 31, 28, 476
• LCM of 34, 83, 617
• LCM of 93, 53, 126
• LCM of 65, 22, 765

1. What is the LCM of 45, 20, 639?

Answer: LCM of 45, 20, 639 is 12780.

2. How to calculate the LCM of 45, 20, 639?

The LCM can be found using two methods. You can either use the LCM formula or the prime factorization method to calculate the LCM of 45, 20, 639.

3. What is the LCM formula?

The LCM formula is LCM(a1, a2, an) = (a1 x a2 x an)/{GCF(a1 x a2 x an) x common factors}.