LCM of 642, 780, 984, 905
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 642, 780, 984, 905 with the LCM of Two or More Numbers Calculator. Here we are teaching you two different methods through which you can calculate the LCM of 642, 780, 984, 905. So, keep reading to learn more.
Given numbers are 642,780,984,905
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 642,780,984,905 is 1238713320.
Find LCM of 642,780,984,905 with Prime Factorization
| 2 | 642, 780, 984, 905 |
| 2 | 321, 390, 492, 905 |
| 3 | 321, 195, 246, 905 |
| 5 | 107, 65, 82, 905 |
| 107, 13, 82, 181 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 3 x 5 x 107 x 13 x 82 x 181 = 1238713320
Therefore, the lowest common multiple of 642,780,984,905 is 1238713320.
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.
642 x 780 x 984 x 905 = 445936795200
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.
642 : 1, 2, 3, 6, 107, 214, 321, 642
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
984 : 1, 2, 3, 4, 6, 8, 12, 24, 41, 82, 123, 164, 246, 328, 492, 984
905 : 1, 5, 181, 905
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 642,780,984,905, is 1.
Now, the common factors can be found like this.
642:2x 3x 107
780:2x 2x 3x 5x 13
984:2x 2x 2x 3x 41
905:5x 181
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 2x 3x 3x 5 = 360
Therefore, the value for common factors is 360.
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 = 445936795200/(1x360)
LCM = 445936795200/360
LCM = 1238713320
Thus, we can understand that the LCM of 642,780,984,905 is 1238713320.
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FAQs on LCM of 642, 780, 984, 905
1. What is the LCM of 642, 780, 984, 905?
Answer: LCM of 642, 780, 984, 905 is 1238713320.
2. How to calculate the LCM of 642, 780, 984, 905?
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 642, 780, 984, 905.
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}.