LCM of 638, 280, 940, 861
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 638, 280, 940, 861 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, 280, 940, 861. So, keep reading to learn more.
Given numbers are 638,280,940,861
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 638,280,940,861 is 516358920.
Find LCM of 638,280,940,861 with Prime Factorization
| 2 | 638, 280, 940, 861 |
| 2 | 319, 140, 470, 861 |
| 5 | 319, 70, 235, 861 |
| 7 | 319, 14, 47, 861 |
| 319, 2, 47, 123 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 5 x 7 x 319 x 2 x 47 x 123 = 516358920
Therefore, the lowest common multiple of 638,280,940,861 is 516358920.
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 280 x 940 x 861 = 144580497600
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
280 : 1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280
940 : 1, 2, 4, 5, 10, 20, 47, 94, 188, 235, 470, 940
861 : 1, 3, 7, 21, 41, 123, 287, 861
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 638,280,940,861, is 1.
Now, the common factors can be found like this.
638:2x 11x 29
280:2x 2x 2x 5x 7
940:2x 2x 5x 47
861:3x 7x 41
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 7 = 280
Therefore, the value for common factors is 280.
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 = 144580497600/(1x280)
LCM = 144580497600/280
LCM = 516358920
Thus, we can understand that the LCM of 638,280,940,861 is 516358920.
LCM of two or more Numbers Calculation Examples
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FAQs on LCM of 638, 280, 940, 861
1. What is the LCM of 638, 280, 940, 861?
Answer: LCM of 638, 280, 940, 861 is 516358920.
2. How to calculate the LCM of 638, 280, 940, 861?
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, 280, 940, 861.
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}.