LCM of 121, 638, 578, 420
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 121, 638, 578, 420 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 121, 638, 578, 420. So, keep reading to learn more.
Given numbers are 121,638,578,420
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 121,638,578,420 is 425922420.
Find LCM of 121,638,578,420 with Prime Factorization
| 2 | 121, 638, 578, 420 |
| 11 | 121, 319, 289, 210 |
| 11, 29, 289, 210 |
Multiply the prime numbers at the bottom and the left side.
2 x 11 x 11 x 29 x 289 x 210 = 425922420
Therefore, the lowest common multiple of 121,638,578,420 is 425922420.
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.
121 x 638 x 578 x 420 = 18740586480
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.
121 : 1, 11, 121
638 : 1, 2, 11, 22, 29, 58, 319, 638
578 : 1, 2, 17, 34, 289, 578
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
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 121,638,578,420, is 1.
Now, the common factors can be found like this.
121:11x 11
638:2x 11x 29
578:2x 17x 17
420:2x 2x 3x 5x 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 11 = 44
Therefore, the value for common factors is 44.
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 = 18740586480/(1x44)
LCM = 18740586480/44
LCM = 425922420
Thus, we can understand that the LCM of 121,638,578,420 is 425922420.
LCM of two or more Numbers Calculation Examples
Here are some samples of LCM of two or more Numbers calculations.
FAQs on LCM of 121, 638, 578, 420
1. What is the LCM of 121, 638, 578, 420?
Answer: LCM of 121, 638, 578, 420 is 425922420.
2. How to calculate the LCM of 121, 638, 578, 420?
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 121, 638, 578, 420.
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}.