LCM of 615, 105, 638, 840
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 615, 105, 638, 840 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 615, 105, 638, 840. So, keep reading to learn more.
Given numbers are 615,105,638,840
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 615,105,638,840 is 10986360.
Find LCM of 615,105,638,840 with Prime Factorization
| 2 | 615, 105, 638, 840 |
| 3 | 615, 105, 319, 420 |
| 5 | 205, 35, 319, 140 |
| 7 | 41, 7, 319, 28 |
| 41, 1, 319, 4 |
Multiply the prime numbers at the bottom and the left side.
2 x 3 x 5 x 7 x 41 x 1 x 319 x 4 = 10986360
Therefore, the lowest common multiple of 615,105,638,840 is 10986360.
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.
615 x 105 x 638 x 840 = 34607034000
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.
615 : 1, 3, 5, 15, 41, 123, 205, 615
105 : 1, 3, 5, 7, 15, 21, 35, 105
638 : 1, 2, 11, 22, 29, 58, 319, 638
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
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 615,105,638,840, is 1.
Now, the common factors can be found like this.
615:3x 5x 41
105:3x 5x 7
638:2x 11x 29
840:2x 2x 2x 3x 5x 7
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 3x 5x 5x 7 = 3150
Therefore, the value for common factors is 3150.
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 = 34607034000/(1x3150)
LCM = 34607034000/3150
LCM = 10986360
Thus, we can understand that the LCM of 615,105,638,840 is 10986360.
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FAQs on LCM of 615, 105, 638, 840
1. What is the LCM of 615, 105, 638, 840?
Answer: LCM of 615, 105, 638, 840 is 10986360.
2. How to calculate the LCM of 615, 105, 638, 840?
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 615, 105, 638, 840.
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}.