LCM of 691, 905, 855, 861
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 691, 905, 855, 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 691, 905, 855, 861. So, keep reading to learn more.
Given numbers are 691,905,855,861
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 691,905,855,861 is 30690547335.
Find LCM of 691,905,855,861 with Prime Factorization
| 3 | 691, 905, 855, 861 |
| 5 | 691, 905, 285, 287 |
| 691, 181, 57, 287 |
Multiply the prime numbers at the bottom and the left side.
3 x 5 x 691 x 181 x 57 x 287 = 30690547335
Therefore, the lowest common multiple of 691,905,855,861 is 30690547335.
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.
691 x 905 x 855 x 861 = 460358210025
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.
691 : 1, 691
905 : 1, 5, 181, 905
855 : 1, 3, 5, 9, 15, 19, 45, 57, 95, 171, 285, 855
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 691,905,855,861, is 1.
Now, the common factors can be found like this.
691:691
905:5x 181
855:3x 3x 5x 19
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.
3x 5 = 15
Therefore, the value for common factors is 15.
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 = 460358210025/(1x15)
LCM = 460358210025/15
LCM = 30690547335
Thus, we can understand that the LCM of 691,905,855,861 is 30690547335.
LCM of two or more Numbers Calculation Examples
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FAQs on LCM of 691, 905, 855, 861
1. What is the LCM of 691, 905, 855, 861?
Answer: LCM of 691, 905, 855, 861 is 30690547335.
2. How to calculate the LCM of 691, 905, 855, 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 691, 905, 855, 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}.