LCM of 821, 401, 455, 420, 391
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 821, 401, 455, 420, 391 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 821, 401, 455, 420, 391. So, keep reading to learn more.
Given numbers are 821,401,455,420,391
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 821,401,455,420,391 is 702840744060.
Find LCM of 821,401,455,420,391 with Prime Factorization
| 5 | 821, 401, 455, 420, 391 |
| 7 | 821, 401, 91, 84, 391 |
| 821, 401, 13, 12, 391 |
Multiply the prime numbers at the bottom and the left side.
5 x 7 x 821 x 401 x 13 x 12 x 391 = 702840744060
Therefore, the lowest common multiple of 821,401,455,420,391 is 702840744060.
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.
821 x 401 x 455 x 420 x 391 = 24599426042100
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.
821 : 1, 821
401 : 1, 401
455 : 1, 5, 7, 13, 35, 65, 91, 455
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
391 : 1, 17, 23, 391
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 821,401,455,420,391, is 1.
Now, the common factors can be found like this.
821:821
401:401
455:5x 7x 13
420:2x 2x 3x 5x 7
391:17x 23
From this, we can see that the common factors because they appear for more than two numbers. So, just multiply them all together.
5x 7 = 35
Therefore, the value for common factors is 35.
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 = 24599426042100/(1x35)
LCM = 24599426042100/35
LCM = 702840744060
Thus, we can understand that the LCM of 821,401,455,420,391 is 702840744060.
LCM of two or more Numbers Calculation Examples
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FAQs on LCM of 821, 401, 455, 420, 391
1. What is the LCM of 821, 401, 455, 420, 391?
Answer: LCM of 821, 401, 455, 420, 391 is 702840744060.
2. How to calculate the LCM of 821, 401, 455, 420, 391?
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 821, 401, 455, 420, 391.
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}.