LCM of 421, 781, 428, 820
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 421, 781, 428, 820 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 421, 781, 428, 820. So, keep reading to learn more.
Given numbers are 421,781,428,820
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 421,781,428,820 is 28848999740.
Find LCM of 421,781,428,820 with Prime Factorization
| 2 | 421, 781, 428, 820 |
| 2 | 421, 781, 214, 410 |
| 421, 781, 107, 205 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 421 x 781 x 107 x 205 = 28848999740
Therefore, the lowest common multiple of 421,781,428,820 is 28848999740.
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.
421 x 781 x 428 x 820 = 115395998960
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.
421 : 1, 421
781 : 1, 11, 71, 781
428 : 1, 2, 4, 107, 214, 428
820 : 1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 421,781,428,820, is 1.
Now, the common factors can be found like this.
421:421
781:11x 71
428:2x 2x 107
820:2x 2x 5x 41
From this, we can see that the common factors because they appear for more than two numbers. So, just multiply them all together.
2x 2 = 4
Therefore, the value for common factors is 4.
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 = 115395998960/(1x4)
LCM = 115395998960/4
LCM = 28848999740
Thus, we can understand that the LCM of 421,781,428,820 is 28848999740.
LCM of two or more Numbers Calculation Examples
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FAQs on LCM of 421, 781, 428, 820
1. What is the LCM of 421, 781, 428, 820?
Answer: LCM of 421, 781, 428, 820 is 28848999740.
2. How to calculate the LCM of 421, 781, 428, 820?
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 421, 781, 428, 820.
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}.