LCM of 388, 788, 420, 790
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 388, 788, 420, 790 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 388, 788, 420, 790. So, keep reading to learn more.
Given numbers are 388,788,420,790
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 388,788,420,790 is 634036620.
Find LCM of 388,788,420,790 with Prime Factorization
| 2 | 388, 788, 420, 790 |
| 2 | 194, 394, 210, 395 |
| 5 | 97, 197, 105, 395 |
| 97, 197, 21, 79 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 5 x 97 x 197 x 21 x 79 = 634036620
Therefore, the lowest common multiple of 388,788,420,790 is 634036620.
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.
388 x 788 x 420 x 790 = 101445859200
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.
388 : 1, 2, 4, 97, 194, 388
788 : 1, 2, 4, 197, 394, 788
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
790 : 1, 2, 5, 10, 79, 158, 395, 790
2 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 388,788,420,790, is 2.
Now, the common factors can be found like this.
388:2x 2x 97
788:2x 2x 197
420:2x 2x 3x 5x 7
790:2x 5x 79
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 5 = 80
Therefore, the value for common factors is 80.
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 = 101445859200/(2x80)
LCM = 101445859200/160
LCM = 634036620
Thus, we can understand that the LCM of 388,788,420,790 is 634036620.
LCM of two or more Numbers Calculation Examples
Here are some samples of LCM of two or more Numbers calculations.
FAQs on LCM of 388, 788, 420, 790
1. What is the LCM of 388, 788, 420, 790?
Answer: LCM of 388, 788, 420, 790 is 634036620.
2. How to calculate the LCM of 388, 788, 420, 790?
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 388, 788, 420, 790.
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}.