LCM of 861, 391, 686, 380, 742
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 861, 391, 686, 380, 742 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 861, 391, 686, 380, 742. So, keep reading to learn more.
Given numbers are 861,391,686,380,742
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 861,391,686,380,742 is 332227405860.
Find LCM of 861,391,686,380,742 with Prime Factorization
| 2 | 861, 391, 686, 380, 742 |
| 7 | 861, 391, 343, 190, 371 |
| 123, 391, 49, 190, 53 |
Multiply the prime numbers at the bottom and the left side.
2 x 7 x 123 x 391 x 49 x 190 x 53 = 332227405860
Therefore, the lowest common multiple of 861,391,686,380,742 is 332227405860.
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.
861 x 391 x 686 x 380 x 742 = 65116571548560
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.
861 : 1, 3, 7, 21, 41, 123, 287, 861
391 : 1, 17, 23, 391
686 : 1, 2, 7, 14, 49, 98, 343, 686
380 : 1, 2, 4, 5, 10, 19, 20, 38, 76, 95, 190, 380
742 : 1, 2, 7, 14, 53, 106, 371, 742
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 861,391,686,380,742, is 1.
Now, the common factors can be found like this.
861:3x 7x 41
391:17x 23
686:2x 7x 7x 7
380:2x 2x 5x 19
742:2x 7x 53
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 7x 7 = 196
Therefore, the value for common factors is 196.
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 = 65116571548560/(1x196)
LCM = 65116571548560/196
LCM = 332227405860
Thus, we can understand that the LCM of 861,391,686,380,742 is 332227405860.
LCM of two or more Numbers Calculation Examples
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FAQs on LCM of 861, 391, 686, 380, 742
1. What is the LCM of 861, 391, 686, 380, 742?
Answer: LCM of 861, 391, 686, 380, 742 is 332227405860.
2. How to calculate the LCM of 861, 391, 686, 380, 742?
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 861, 391, 686, 380, 742.
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}.