Given numbers are 638,21,808

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

The LCM of 638,21,808 is 5412792.

Find LCM of 638,21,808 with Prime Factorization

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

2 x 319 x 21 x 404 = 5412792

Therefore, the lowest common multiple of 638,21,808 is 5412792.

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.

638 x 21 x 808 = 10825584

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.

638 : 1, 2, 11, 22, 29, 58, 319, 638

21 : 1, 3, 7, 21

808 : 1, 2, 4, 8, 101, 202, 404, 808

1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 638,21,808, is 1.

Now, the common factors can be found like this.

638:2x 11x 29

21:3x 7

808:2x 2x 2x 101

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

2 = 2

Therefore, the value for common factors is 2.

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 = 10825584/(1x2)

LCM = 10825584/2

LCM = 5412792

Thus, we can understand that the LCM of 638,21,808 is 5412792.

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

• LCM of 137, 42, 395
• LCM of 121, 96, 321
• LCM of 761, 41, 852
• LCM of 684, 59, 103
• LCM of 897, 48, 760

1. What is the LCM of 638, 21, 808?

Answer: LCM of 638, 21, 808 is 5412792.

2. How to calculate the LCM of 638, 21, 808?

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 638, 21, 808.

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}.