LCM of 686, 678, 721, 747
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 686, 678, 721, 747 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 686, 678, 721, 747. So, keep reading to learn more.
Given numbers are 686,678,721,747
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 686,678,721,747 is 5964312438.
Find LCM of 686,678,721,747 with Prime Factorization
| 2 | 686, 678, 721, 747 |
| 3 | 343, 339, 721, 747 |
| 7 | 343, 113, 721, 249 |
| 49, 113, 103, 249 |
Multiply the prime numbers at the bottom and the left side.
2 x 3 x 7 x 49 x 113 x 103 x 249 = 5964312438
Therefore, the lowest common multiple of 686,678,721,747 is 5964312438.
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.
686 x 678 x 721 x 747 = 250501122396
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.
686 : 1, 2, 7, 14, 49, 98, 343, 686
678 : 1, 2, 3, 6, 113, 226, 339, 678
721 : 1, 7, 103, 721
747 : 1, 3, 9, 83, 249, 747
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 686,678,721,747, is 1.
Now, the common factors can be found like this.
686:2x 7x 7x 7
678:2x 3x 113
721:7x 103
747:3x 3x 83
From this, we can see that the common factors because they appear for more than two numbers. So, just multiply them all together.
2x 3x 7 = 42
Therefore, the value for common factors is 42.
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 = 250501122396/(1x42)
LCM = 250501122396/42
LCM = 5964312438
Thus, we can understand that the LCM of 686,678,721,747 is 5964312438.
LCM of two or more Numbers Calculation Examples
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FAQs on LCM of 686, 678, 721, 747
1. What is the LCM of 686, 678, 721, 747?
Answer: LCM of 686, 678, 721, 747 is 5964312438.
2. How to calculate the LCM of 686, 678, 721, 747?
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 686, 678, 721, 747.
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}.