LCM of 643, 840, 516, 686
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 643, 840, 516, 686 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 643, 840, 516, 686. So, keep reading to learn more.
Given numbers are 643,840,516,686
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 643,840,516,686 is 1138032840.
Find LCM of 643,840,516,686 with Prime Factorization
| 2 | 643, 840, 516, 686 |
| 2 | 643, 420, 258, 343 |
| 3 | 643, 210, 129, 343 |
| 7 | 643, 70, 43, 343 |
| 643, 10, 43, 49 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 3 x 7 x 643 x 10 x 43 x 49 = 1138032840
Therefore, the lowest common multiple of 643,840,516,686 is 1138032840.
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.
643 x 840 x 516 x 686 = 191189517120
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.
643 : 1, 643
840 : 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 28, 30, 35, 40, 42, 56, 60, 70, 84, 105, 120, 140, 168, 210, 280, 420, 840
516 : 1, 2, 3, 4, 6, 12, 43, 86, 129, 172, 258, 516
686 : 1, 2, 7, 14, 49, 98, 343, 686
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 643,840,516,686, is 1.
Now, the common factors can be found like this.
643:643
840:2x 2x 2x 3x 5x 7
516:2x 2x 3x 43
686:2x 7x 7x 7
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 = 191189517120/(1x168)
LCM = 191189517120/168
LCM = 1138032840
Thus, we can understand that the LCM of 643,840,516,686 is 1138032840.
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FAQs on LCM of 643, 840, 516, 686
1. What is the LCM of 643, 840, 516, 686?
Answer: LCM of 643, 840, 516, 686 is 1138032840.
2. How to calculate the LCM of 643, 840, 516, 686?
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 643, 840, 516, 686.
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}.