LCM of 391, 420, 436, 645, 731
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 391, 420, 436, 645, 731 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 391, 420, 436, 645, 731. So, keep reading to learn more.
Given numbers are 391,420,436,645,731
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 391,420,436,645,731 is 769699140.
Find LCM of 391,420,436,645,731 with Prime Factorization
| 2 | 391, 420, 436, 645, 731 |
| 2 | 391, 210, 218, 645, 731 |
| 3 | 391, 105, 109, 645, 731 |
| 5 | 391, 35, 109, 215, 731 |
| 17 | 391, 7, 109, 43, 731 |
| 43 | 23, 7, 109, 43, 43 |
| 23, 7, 109, 1, 1 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 3 x 5 x 17 x 43 x 23 x 7 x 109 x 1 x 1 = 769699140
Therefore, the lowest common multiple of 391,420,436,645,731 is 769699140.
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.
391 x 420 x 436 x 645 x 731 = 33759004280400
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.
391 : 1, 17, 23, 391
420 : 1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 60, 70, 84, 105, 140, 210, 420
436 : 1, 2, 4, 109, 218, 436
645 : 1, 3, 5, 15, 43, 129, 215, 645
731 : 1, 17, 43, 731
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 391,420,436,645,731, is 1.
Now, the common factors can be found like this.
391:17x 23
420:2x 2x 3x 5x 7
436:2x 2x 109
645:3x 5x 43
731:17x 43
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 3x 5x 17x 43 = 43860
Therefore, the value for common factors is 43860.
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 = 33759004280400/(1x43860)
LCM = 33759004280400/43860
LCM = 769699140
Thus, we can understand that the LCM of 391,420,436,645,731 is 769699140.
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FAQs on LCM of 391, 420, 436, 645, 731
1. What is the LCM of 391, 420, 436, 645, 731?
Answer: LCM of 391, 420, 436, 645, 731 is 769699140.
2. How to calculate the LCM of 391, 420, 436, 645, 731?
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 391, 420, 436, 645, 731.
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}.