LCM of 408, 921, 785, 392, 645
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 408, 921, 785, 392, 645 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, 921, 785, 392, 645. So, keep reading to learn more.
Given numbers are 408,921,785,392,645
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 408,921,785,392,645 is 207172797720.
Find LCM of 408,921,785,392,645 with Prime Factorization
| 2 | 408, 921, 785, 392, 645 |
| 2 | 204, 921, 785, 196, 645 |
| 2 | 102, 921, 785, 98, 645 |
| 3 | 51, 921, 785, 49, 645 |
| 5 | 17, 307, 785, 49, 215 |
| 17, 307, 157, 49, 43 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 2 x 3 x 5 x 17 x 307 x 157 x 49 x 43 = 207172797720
Therefore, the lowest common multiple of 408,921,785,392,645 is 207172797720.
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 921 x 785 x 392 x 645 = 74582207179200
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
921 : 1, 3, 307, 921
785 : 1, 5, 157, 785
392 : 1, 2, 4, 7, 8, 14, 28, 49, 56, 98, 196, 392
645 : 1, 3, 5, 15, 43, 129, 215, 645
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 408,921,785,392,645, is 1.
Now, the common factors can be found like this.
408:2x 2x 2x 3x 17
921:3x 307
785:5x 157
392:2x 2x 2x 7x 7
645:3x 5x 43
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 3x 3x 5 = 360
Therefore, the value for common factors is 360.
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 = 74582207179200/(1x360)
LCM = 74582207179200/360
LCM = 207172797720
Thus, we can understand that the LCM of 408,921,785,392,645 is 207172797720.
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FAQs on LCM of 408, 921, 785, 392, 645
1. What is the LCM of 408, 921, 785, 392, 645?
Answer: LCM of 408, 921, 785, 392, 645 is 207172797720.
2. How to calculate the LCM of 408, 921, 785, 392, 645?
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, 921, 785, 392, 645.
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}.