Given numbers are 78,30,21,891

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

The LCM of 78,30,21,891 is 810810.

Find LCM of 78,30,21,891 with Prime Factorization

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

2 x 3 x 13 x 5 x 7 x 297 = 810810

Therefore, the lowest common multiple of 78,30,21,891 is 810810.

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.

78 x 30 x 21 x 891 = 43783740

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.

78 : 1, 2, 3, 6, 13, 26, 39, 78

30 : 1, 2, 3, 5, 6, 10, 15, 30

21 : 1, 3, 7, 21

891 : 1, 3, 9, 11, 27, 33, 81, 99, 297, 891

3 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 78,30,21,891, is 3.

Now, the common factors can be found like this.

78:2x 3x 13

30:2x 3x 5

21:3x 7

891:3x 3x 3x 3x 11

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

2x 3x 3 = 18

Therefore, the value for common factors is 18.

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 = 43783740/(3x18)

LCM = 43783740/54

LCM = 810810

Thus, we can understand that the LCM of 78,30,21,891 is 810810.

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

• LCM of 18, 50, 70, 216
• LCM of 78, 10, 87, 689
• LCM of 41, 83, 64, 945
• LCM of 37, 46, 21, 210
• LCM of 29, 51, 41, 811

1. What is the LCM of 78, 30, 21, 891?

Answer: LCM of 78, 30, 21, 891 is 810810.

2. How to calculate the LCM of 78, 30, 21, 891?

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 78, 30, 21, 891.

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}.