LCM of 642, 644, 917, 720
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 642, 644, 917, 720 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 642, 644, 917, 720. So, keep reading to learn more.
Given numbers are 642,644,917,720
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 642,644,917,720 is 1624850640.
Find LCM of 642,644,917,720 with Prime Factorization
| 2 | 642, 644, 917, 720 |
| 2 | 321, 322, 917, 360 |
| 3 | 321, 161, 917, 180 |
| 7 | 107, 161, 917, 60 |
| 107, 23, 131, 60 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 3 x 7 x 107 x 23 x 131 x 60 = 1624850640
Therefore, the lowest common multiple of 642,644,917,720 is 1624850640.
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.
642 x 644 x 917 x 720 = 272974907520
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.
642 : 1, 2, 3, 6, 107, 214, 321, 642
644 : 1, 2, 4, 7, 14, 23, 28, 46, 92, 161, 322, 644
917 : 1, 7, 131, 917
720 : 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 30, 36, 40, 45, 48, 60, 72, 80, 90, 120, 144, 180, 240, 360, 720
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 642,644,917,720, is 1.
Now, the common factors can be found like this.
642:2x 3x 107
644:2x 2x 7x 23
917:7x 131
720:2x 2x 2x 2x 3x 3x 5
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 7 = 168
Therefore, the value for common factors is 168.
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 = 272974907520/(1x168)
LCM = 272974907520/168
LCM = 1624850640
Thus, we can understand that the LCM of 642,644,917,720 is 1624850640.
LCM of two or more Numbers Calculation Examples
Here are some samples of LCM of two or more Numbers calculations.
FAQs on LCM of 642, 644, 917, 720
1. What is the LCM of 642, 644, 917, 720?
Answer: LCM of 642, 644, 917, 720 is 1624850640.
2. How to calculate the LCM of 642, 644, 917, 720?
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 642, 644, 917, 720.
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}.