LCM of 644, 391, 205, 221
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 644, 391, 205, 221 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 644, 391, 205, 221. So, keep reading to learn more.
Given numbers are 644,391,205,221
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 644,391,205,221 is 29176420.
Find LCM of 644,391,205,221 with Prime Factorization
| 17 | 644, 391, 205, 221 |
| 23 | 644, 23, 205, 13 |
| 28, 1, 205, 13 |
Multiply the prime numbers at the bottom and the left side.
17 x 23 x 28 x 1 x 205 x 13 = 29176420
Therefore, the lowest common multiple of 644,391,205,221 is 29176420.
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.
644 x 391 x 205 x 221 = 11407980220
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.
644 : 1, 2, 4, 7, 14, 23, 28, 46, 92, 161, 322, 644
391 : 1, 17, 23, 391
205 : 1, 5, 41, 205
221 : 1, 13, 17, 221
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 644,391,205,221, is 1.
Now, the common factors can be found like this.
644:2x 2x 7x 23
391:17x 23
205:5x 41
221:13x 17
From this, we can see that the common factors because they appear for more than two numbers. So, just multiply them all together.
17x 23 = 391
Therefore, the value for common factors is 391.
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 = 11407980220/(1x391)
LCM = 11407980220/391
LCM = 29176420
Thus, we can understand that the LCM of 644,391,205,221 is 29176420.
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FAQs on LCM of 644, 391, 205, 221
1. What is the LCM of 644, 391, 205, 221?
Answer: LCM of 644, 391, 205, 221 is 29176420.
2. How to calculate the LCM of 644, 391, 205, 221?
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 644, 391, 205, 221.
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}.