LCM of 721, 781, 391, 638
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 721, 781, 391, 638 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 721, 781, 391, 638. So, keep reading to learn more.
Given numbers are 721,781,391,638
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 721,781,391,638 is 12770004478.
Find LCM of 721,781,391,638 with Prime Factorization
| 11 | 721, 781, 391, 638 |
| 721, 71, 391, 58 |
Multiply the prime numbers at the bottom and the left side.
11 x 721 x 71 x 391 x 58 = 12770004478
Therefore, the lowest common multiple of 721,781,391,638 is 12770004478.
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.
721 x 781 x 391 x 638 = 140470049258
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.
721 : 1, 7, 103, 721
781 : 1, 11, 71, 781
391 : 1, 17, 23, 391
638 : 1, 2, 11, 22, 29, 58, 319, 638
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 721,781,391,638, is 1.
Now, the common factors can be found like this.
721:7x 103
781:11x 71
391:17x 23
638:2x 11x 29
From this, we can see that the common factors because they appear for more than two numbers. So, just multiply them all together.
11 = 11
Therefore, the value for common factors is 11.
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 = 140470049258/(1x11)
LCM = 140470049258/11
LCM = 12770004478
Thus, we can understand that the LCM of 721,781,391,638 is 12770004478.
LCM of two or more Numbers Calculation Examples
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FAQs on LCM of 721, 781, 391, 638
1. What is the LCM of 721, 781, 391, 638?
Answer: LCM of 721, 781, 391, 638 is 12770004478.
2. How to calculate the LCM of 721, 781, 391, 638?
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 721, 781, 391, 638.
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}.