LCM of 981, 420, 621, 905
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 981, 420, 621, 905 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 981, 420, 621, 905. So, keep reading to learn more.
Given numbers are 981,420,621,905
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 981,420,621,905 is 1715239260.
Find LCM of 981,420,621,905 with Prime Factorization
| 3 | 981, 420, 621, 905 |
| 3 | 327, 140, 207, 905 |
| 5 | 109, 140, 69, 905 |
| 109, 28, 69, 181 |
Multiply the prime numbers at the bottom and the left side.
3 x 3 x 5 x 109 x 28 x 69 x 181 = 1715239260
Therefore, the lowest common multiple of 981,420,621,905 is 1715239260.
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.
981 x 420 x 621 x 905 = 231557300100
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.
981 : 1, 3, 9, 109, 327, 981
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
621 : 1, 3, 9, 23, 27, 69, 207, 621
905 : 1, 5, 181, 905
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 981,420,621,905, is 1.
Now, the common factors can be found like this.
981:3x 3x 109
420:2x 2x 3x 5x 7
621:3x 3x 3x 23
905:5x 181
From this, we can see that the common factors because they appear for more than two numbers. So, just multiply them all together.
3x 3x 3x 5 = 135
Therefore, the value for common factors is 135.
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 = 231557300100/(1x135)
LCM = 231557300100/135
LCM = 1715239260
Thus, we can understand that the LCM of 981,420,621,905 is 1715239260.
LCM of two or more Numbers Calculation Examples
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FAQs on LCM of 981, 420, 621, 905
1. What is the LCM of 981, 420, 621, 905?
Answer: LCM of 981, 420, 621, 905 is 1715239260.
2. How to calculate the LCM of 981, 420, 621, 905?
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 981, 420, 621, 905.
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}.