LCM of 391, 768, 408, 821
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 391, 768, 408, 821 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 391, 768, 408, 821. So, keep reading to learn more.
Given numbers are 391,768,408,821
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 391,768,408,821 is 246536448.
Find LCM of 391,768,408,821 with Prime Factorization
| 2 | 391, 768, 408, 821 |
| 2 | 391, 384, 204, 821 |
| 2 | 391, 192, 102, 821 |
| 3 | 391, 96, 51, 821 |
| 17 | 391, 32, 17, 821 |
| 23, 32, 1, 821 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 2 x 3 x 17 x 23 x 32 x 1 x 821 = 246536448
Therefore, the lowest common multiple of 391,768,408,821 is 246536448.
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.
391 x 768 x 408 x 821 = 100586870784
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.
391 : 1, 17, 23, 391
768 : 1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 128, 192, 256, 384, 768
408 : 1, 2, 3, 4, 6, 8, 12, 17, 24, 34, 51, 68, 102, 136, 204, 408
821 : 1, 821
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 391,768,408,821, is 1.
Now, the common factors can be found like this.
391:17x 23
768:2x 2x 2x 2x 2x 2x 2x 2x 3
408:2x 2x 2x 3x 17
821:821
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 17 = 408
Therefore, the value for common factors is 408.
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 = 100586870784/(1x408)
LCM = 100586870784/408
LCM = 246536448
Thus, we can understand that the LCM of 391,768,408,821 is 246536448.
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FAQs on LCM of 391, 768, 408, 821
1. What is the LCM of 391, 768, 408, 821?
Answer: LCM of 391, 768, 408, 821 is 246536448.
2. How to calculate the LCM of 391, 768, 408, 821?
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 391, 768, 408, 821.
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}.