LCM of 221, 705, 768, 391
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 221, 705, 768, 391 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 221, 705, 768, 391. So, keep reading to learn more.
Given numbers are 221,705,768,391
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 221,705,768,391 is 917379840.
Find LCM of 221,705,768,391 with Prime Factorization
| 3 | 221, 705, 768, 391 |
| 17 | 221, 235, 256, 391 |
| 13, 235, 256, 23 |
Multiply the prime numbers at the bottom and the left side.
3 x 17 x 13 x 235 x 256 x 23 = 917379840
Therefore, the lowest common multiple of 221,705,768,391 is 917379840.
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.
221 x 705 x 768 x 391 = 46786371840
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.
221 : 1, 13, 17, 221
705 : 1, 3, 5, 15, 47, 141, 235, 705
768 : 1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 128, 192, 256, 384, 768
391 : 1, 17, 23, 391
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 221,705,768,391, is 1.
Now, the common factors can be found like this.
221:13x 17
705:3x 5x 47
768:2x 2x 2x 2x 2x 2x 2x 2x 3
391:17x 23
From this, we can see that the common factors because they appear for more than two numbers. So, just multiply them all together.
3x 17 = 51
Therefore, the value for common factors is 51.
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 = 46786371840/(1x51)
LCM = 46786371840/51
LCM = 917379840
Thus, we can understand that the LCM of 221,705,768,391 is 917379840.
LCM of two or more Numbers Calculation Examples
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FAQs on LCM of 221, 705, 768, 391
1. What is the LCM of 221, 705, 768, 391?
Answer: LCM of 221, 705, 768, 391 is 917379840.
2. How to calculate the LCM of 221, 705, 768, 391?
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 221, 705, 768, 391.
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}.