LCM of 840, 686, 981
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 840, 686, 981 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 840, 686, 981. So, keep reading to learn more.
Given numbers are 840,686,981
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 840,686,981 is 13459320.
Find LCM of 840,686,981 with Prime Factorization
| 2 | 840, 686, 981 |
| 3 | 420, 343, 981 |
| 7 | 140, 343, 327 |
| 20, 49, 327 |
Multiply the prime numbers at the bottom and the left side.
2 x 3 x 7 x 20 x 49 x 327 = 13459320
Therefore, the lowest common multiple of 840,686,981 is 13459320.
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.
840 x 686 x 981 = 565291440
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.
840 : 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 28, 30, 35, 40, 42, 56, 60, 70, 84, 105, 120, 140, 168, 210, 280, 420, 840
686 : 1, 2, 7, 14, 49, 98, 343, 686
981 : 1, 3, 9, 109, 327, 981
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 840,686,981, is 1.
Now, the common factors can be found like this.
840:2x 2x 2x 3x 5x 7
686:2x 7x 7x 7
981:3x 3x 109
From this, we can see that the common factors because they appear for more than two numbers. So, just multiply them all together.
2x 3x 7 = 42
Therefore, the value for common factors is 42.
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 = 565291440/(1x42)
LCM = 565291440/42
LCM = 13459320
Thus, we can understand that the LCM of 840,686,981 is 13459320.
LCM of two or more Numbers Calculation Examples
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FAQs on LCM of 840, 686, 981
1. What is the LCM of 840, 686, 981?
Answer: LCM of 840, 686, 981 is 13459320.
2. How to calculate the LCM of 840, 686, 981?
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 840, 686, 981.
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}.