LCM of 408, 418, 840, 390
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 408, 418, 840, 390 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 408, 418, 840, 390. So, keep reading to learn more.
Given numbers are 408,418,840,390
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 408,418,840,390 is 38798760.
Find LCM of 408,418,840,390 with Prime Factorization
| 2 | 408, 418, 840, 390 |
| 2 | 204, 209, 420, 195 |
| 2 | 102, 209, 210, 195 |
| 3 | 51, 209, 105, 195 |
| 5 | 17, 209, 35, 65 |
| 17, 209, 7, 13 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 2 x 3 x 5 x 17 x 209 x 7 x 13 = 38798760
Therefore, the lowest common multiple of 408,418,840,390 is 38798760.
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.
408 x 418 x 840 x 390 = 55870214400
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.
408 : 1, 2, 3, 4, 6, 8, 12, 17, 24, 34, 51, 68, 102, 136, 204, 408
418 : 1, 2, 11, 19, 22, 38, 209, 418
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
390 : 1, 2, 3, 5, 6, 10, 13, 15, 26, 30, 39, 65, 78, 130, 195, 390
2 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 408,418,840,390, is 2.
Now, the common factors can be found like this.
408:2x 2x 2x 3x 17
418:2x 11x 19
840:2x 2x 2x 3x 5x 7
390:2x 3x 5x 13
From this, we can see that the common factors because they appear for more than two numbers. So, just multiply them all together.
2x 2x 2x 2x 3x 3x 5 = 720
Therefore, the value for common factors is 720.
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 = 55870214400/(2x720)
LCM = 55870214400/1440
LCM = 38798760
Thus, we can understand that the LCM of 408,418,840,390 is 38798760.
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FAQs on LCM of 408, 418, 840, 390
1. What is the LCM of 408, 418, 840, 390?
Answer: LCM of 408, 418, 840, 390 is 38798760.
2. How to calculate the LCM of 408, 418, 840, 390?
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 408, 418, 840, 390.
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}.