LCM of 638, 928, 820, 870
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 638, 928, 820, 870 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 638, 928, 820, 870. So, keep reading to learn more.
Given numbers are 638,928,820,870
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 638,928,820,870 is 6277920.
Find LCM of 638,928,820,870 with Prime Factorization
| 2 | 638, 928, 820, 870 |
| 2 | 319, 464, 410, 435 |
| 5 | 319, 232, 205, 435 |
| 29 | 319, 232, 41, 87 |
| 11, 8, 41, 3 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 5 x 29 x 11 x 8 x 41 x 3 = 6277920
Therefore, the lowest common multiple of 638,928,820,870 is 6277920.
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 928 x 820 x 870 = 422378457600
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
928 : 1, 2, 4, 8, 16, 29, 32, 58, 116, 232, 464, 928
820 : 1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820
870 : 1, 2, 3, 5, 6, 10, 15, 29, 30, 58, 87, 145, 174, 290, 435, 870
2 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 638,928,820,870, is 2.
Now, the common factors can be found like this.
638:2x 11x 29
928:2x 2x 2x 2x 2x 29
820:2x 2x 5x 41
870:2x 3x 5x 29
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 5x 29x 29 = 33640
Therefore, the value for common factors is 33640.
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 = 422378457600/(2x33640)
LCM = 422378457600/67280
LCM = 6277920
Thus, we can understand that the LCM of 638,928,820,870 is 6277920.
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FAQs on LCM of 638, 928, 820, 870
1. What is the LCM of 638, 928, 820, 870?
Answer: LCM of 638, 928, 820, 870 is 6277920.
2. How to calculate the LCM of 638, 928, 820, 870?
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, 928, 820, 870.
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}.