LCM of 399, 905, 721, 642
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 399, 905, 721, 642 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 399, 905, 721, 642. So, keep reading to learn more.
Given numbers are 399,905,721,642
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 399,905,721,642 is 7959255990.
Find LCM of 399,905,721,642 with Prime Factorization
| 3 | 399, 905, 721, 642 |
| 7 | 133, 905, 721, 214 |
| 19, 905, 103, 214 |
Multiply the prime numbers at the bottom and the left side.
3 x 7 x 19 x 905 x 103 x 214 = 7959255990
Therefore, the lowest common multiple of 399,905,721,642 is 7959255990.
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.
399 x 905 x 721 x 642 = 167144375790
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.
399 : 1, 3, 7, 19, 21, 57, 133, 399
905 : 1, 5, 181, 905
721 : 1, 7, 103, 721
642 : 1, 2, 3, 6, 107, 214, 321, 642
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 399,905,721,642, is 1.
Now, the common factors can be found like this.
399:3x 7x 19
905:5x 181
721:7x 103
642:2x 3x 107
From this, we can see that the common factors because they appear for more than two numbers. So, just multiply them all together.
3x 7 = 21
Therefore, the value for common factors is 21.
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 = 167144375790/(1x21)
LCM = 167144375790/21
LCM = 7959255990
Thus, we can understand that the LCM of 399,905,721,642 is 7959255990.
LCM of two or more Numbers Calculation Examples
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FAQs on LCM of 399, 905, 721, 642
1. What is the LCM of 399, 905, 721, 642?
Answer: LCM of 399, 905, 721, 642 is 7959255990.
2. How to calculate the LCM of 399, 905, 721, 642?
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 399, 905, 721, 642.
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}.