Given numbers are 641,831,420,780

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

The LCM of 641,831,420,780 is 969461220.

Find LCM of 641,831,420,780 with Prime Factorization

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

2 x 2 x 3 x 5 x 641 x 277 x 7 x 13 = 969461220

Therefore, the lowest common multiple of 641,831,420,780 is 969461220.

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.

641 x 831 x 420 x 780 = 174503019600

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.

641 : 1, 641

831 : 1, 3, 277, 831

420 : 1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 60, 70, 84, 105, 140, 210, 420

780 : 1, 2, 3, 4, 5, 6, 10, 12, 13, 15, 20, 26, 30, 39, 52, 60, 65, 78, 130, 156, 195, 260, 390, 780

1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 641,831,420,780, is 1.

Now, the common factors can be found like this.

641:641

831:3x 277

420:2x 2x 3x 5x 7

780:2x 2x 3x 5x 13

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 3x 3x 5 = 180

Therefore, the value for common factors is 180.

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 = 174503019600/(1x180)

LCM = 174503019600/180

LCM = 969461220

Thus, we can understand that the LCM of 641,831,420,780 is 969461220.

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

• LCM of 188, 280, 841, 269
• LCM of 140, 899, 100, 630
• LCM of 337, 535, 800, 171
• LCM of 334, 520, 116, 606
• LCM of 606, 321, 430, 332

1. What is the LCM of 641, 831, 420, 780?

Answer: LCM of 641, 831, 420, 780 is 969461220.

2. How to calculate the LCM of 641, 831, 420, 780?

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 641, 831, 420, 780.

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}.