LCM of 782, 972, 920, 642
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 782, 972, 920, 642 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 782, 972, 920, 642. So, keep reading to learn more.
Given numbers are 782,972,920,642
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 782,972,920,642 is 406655640.
Find LCM of 782,972,920,642 with Prime Factorization
| 2 | 782, 972, 920, 642 |
| 2 | 391, 486, 460, 321 |
| 3 | 391, 243, 230, 321 |
| 23 | 391, 81, 230, 107 |
| 17, 81, 10, 107 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 3 x 23 x 17 x 81 x 10 x 107 = 406655640
Therefore, the lowest common multiple of 782,972,920,642 is 406655640.
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.
782 x 972 x 920 x 642 = 448947826560
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.
782 : 1, 2, 17, 23, 34, 46, 391, 782
972 : 1, 2, 3, 4, 6, 9, 12, 18, 27, 36, 54, 81, 108, 162, 243, 324, 486, 972
920 : 1, 2, 4, 5, 8, 10, 20, 23, 40, 46, 92, 115, 184, 230, 460, 920
642 : 1, 2, 3, 6, 107, 214, 321, 642
2 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 782,972,920,642, is 2.
Now, the common factors can be found like this.
782:2x 17x 23
972:2x 2x 3x 3x 3x 3x 3
920:2x 2x 2x 5x 23
642:2x 3x 107
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 23 = 552
Therefore, the value for common factors is 552.
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 = 448947826560/(2x552)
LCM = 448947826560/1104
LCM = 406655640
Thus, we can understand that the LCM of 782,972,920,642 is 406655640.
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FAQs on LCM of 782, 972, 920, 642
1. What is the LCM of 782, 972, 920, 642?
Answer: LCM of 782, 972, 920, 642 is 406655640.
2. How to calculate the LCM of 782, 972, 920, 642?
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 782, 972, 920, 642.
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}.