LCM of 420, 356, 821
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 420, 356, 821 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 420, 356, 821. So, keep reading to learn more.
Given numbers are 420,356,821
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 420,356,821 is 30688980.
Find LCM of 420,356,821 with Prime Factorization
| 2 | 420, 356, 821 |
| 2 | 210, 178, 821 |
| 105, 89, 821 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 105 x 89 x 821 = 30688980
Therefore, the lowest common multiple of 420,356,821 is 30688980.
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.
420 x 356 x 821 = 122755920
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.
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
356 : 1, 2, 4, 89, 178, 356
821 : 1, 821
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 420,356,821, is 1.
Now, the common factors can be found like this.
420:2x 2x 3x 5x 7
356:2x 2x 89
821:821
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 = 122755920/(1x4)
LCM = 122755920/4
LCM = 30688980
Thus, we can understand that the LCM of 420,356,821 is 30688980.
LCM of two or more Numbers Calculation Examples
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FAQs on LCM of 420, 356, 821
1. What is the LCM of 420, 356, 821?
Answer: LCM of 420, 356, 821 is 30688980.
2. How to calculate the LCM of 420, 356, 821?
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 420, 356, 821.
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}.