LCM of 643, 672, 392, 920
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 643, 672, 392, 920 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, 672, 392, 920. So, keep reading to learn more.
Given numbers are 643,672,392,920
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 643,672,392,920 is 347837280.
Find LCM of 643,672,392,920 with Prime Factorization
| 2 | 643, 672, 392, 920 |
| 2 | 643, 336, 196, 460 |
| 2 | 643, 168, 98, 230 |
| 7 | 643, 84, 49, 115 |
| 643, 12, 7, 115 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 2 x 7 x 643 x 12 x 7 x 115 = 347837280
Therefore, the lowest common multiple of 643,672,392,920 is 347837280.
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 672 x 392 x 920 = 155831101440
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
672 : 1, 2, 3, 4, 6, 7, 8, 12, 14, 16, 21, 24, 28, 32, 42, 48, 56, 84, 96, 112, 168, 224, 336, 672
392 : 1, 2, 4, 7, 8, 14, 28, 49, 56, 98, 196, 392
920 : 1, 2, 4, 5, 8, 10, 20, 23, 40, 46, 92, 115, 184, 230, 460, 920
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 643,672,392,920, is 1.
Now, the common factors can be found like this.
643:643
672:2x 2x 2x 2x 2x 3x 7
392:2x 2x 2x 7x 7
920:2x 2x 2x 5x 23
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 2x 2x 2x 7 = 448
Therefore, the value for common factors is 448.
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 = 155831101440/(1x448)
LCM = 155831101440/448
LCM = 347837280
Thus, we can understand that the LCM of 643,672,392,920 is 347837280.
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FAQs on LCM of 643, 672, 392, 920
1. What is the LCM of 643, 672, 392, 920?
Answer: LCM of 643, 672, 392, 920 is 347837280.
2. How to calculate the LCM of 643, 672, 392, 920?
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, 672, 392, 920.
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}.