Given numbers are 638,440,442,421

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

The LCM of 638,440,442,421 is 1187203160.

Find LCM of 638,440,442,421 with Prime Factorization

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

2 x 11 x 29 x 20 x 221 x 421 = 1187203160

Therefore, the lowest common multiple of 638,440,442,421 is 1187203160.

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 440 x 442 x 421 = 52236939040

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

440 : 1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 88, 110, 220, 440

442 : 1, 2, 13, 17, 26, 34, 221, 442

421 : 1, 421

1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 638,440,442,421, is 1.

Now, the common factors can be found like this.

638:2x 11x 29

440:2x 2x 2x 5x 11

442:2x 13x 17

421:421

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

2x 2x 11 = 44

Therefore, the value for common factors is 44.

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 = 52236939040/(1x44)

LCM = 52236939040/44

LCM = 1187203160

Thus, we can understand that the LCM of 638,440,442,421 is 1187203160.

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

• LCM of 643, 704, 949, 960
• LCM of 807, 302, 888, 162
• LCM of 902, 500, 829, 753
• LCM of 547, 876, 998, 684
• LCM of 847, 289, 870, 416

1. What is the LCM of 638, 440, 442, 421?

Answer: LCM of 638, 440, 442, 421 is 1187203160.

2. How to calculate the LCM of 638, 440, 442, 421?

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, 440, 442, 421.

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}.