LCM of 640, 285, 805, 742
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 640, 285, 805, 742 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 640, 285, 805, 742. So, keep reading to learn more.
Given numbers are 640,285,805,742
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 640,285,805,742 is 311283840.
Find LCM of 640,285,805,742 with Prime Factorization
| 2 | 640, 285, 805, 742 |
| 5 | 320, 285, 805, 371 |
| 7 | 64, 57, 161, 371 |
| 64, 57, 23, 53 |
Multiply the prime numbers at the bottom and the left side.
2 x 5 x 7 x 64 x 57 x 23 x 53 = 311283840
Therefore, the lowest common multiple of 640,285,805,742 is 311283840.
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.
640 x 285 x 805 x 742 = 108949344000
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.
640 : 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640
285 : 1, 3, 5, 15, 19, 57, 95, 285
805 : 1, 5, 7, 23, 35, 115, 161, 805
742 : 1, 2, 7, 14, 53, 106, 371, 742
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 640,285,805,742, is 1.
Now, the common factors can be found like this.
640:2x 2x 2x 2x 2x 2x 2x 5
285:3x 5x 19
805:5x 7x 23
742:2x 7x 53
From this, we can see that the common factors because they appear for more than two numbers. So, just multiply them all together.
2x 5x 5x 7 = 350
Therefore, the value for common factors is 350.
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 = 108949344000/(1x350)
LCM = 108949344000/350
LCM = 311283840
Thus, we can understand that the LCM of 640,285,805,742 is 311283840.
LCM of two or more Numbers Calculation Examples
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FAQs on LCM of 640, 285, 805, 742
1. What is the LCM of 640, 285, 805, 742?
Answer: LCM of 640, 285, 805, 742 is 311283840.
2. How to calculate the LCM of 640, 285, 805, 742?
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 640, 285, 805, 742.
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}.