LCM of 690, 989, 647, 920
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 690, 989, 647, 920 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 690, 989, 647, 920. So, keep reading to learn more.
Given numbers are 690,989,647,920
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 690,989,647,920 is 76785960.
Find LCM of 690,989,647,920 with Prime Factorization
| 2 | 690, 989, 647, 920 |
| 5 | 345, 989, 647, 460 |
| 23 | 69, 989, 647, 92 |
| 3, 43, 647, 4 |
Multiply the prime numbers at the bottom and the left side.
2 x 5 x 23 x 3 x 43 x 647 x 4 = 76785960
Therefore, the lowest common multiple of 690,989,647,920 is 76785960.
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.
690 x 989 x 647 x 920 = 406197728400
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.
690 : 1, 2, 3, 5, 6, 10, 15, 23, 30, 46, 69, 115, 138, 230, 345, 690
989 : 1, 23, 43, 989
647 : 1, 647
920 : 1, 2, 4, 5, 8, 10, 20, 23, 40, 46, 92, 115, 184, 230, 460, 920
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 690,989,647,920, is 1.
Now, the common factors can be found like this.
690:2x 3x 5x 23
989:23x 43
647:647
920:2x 2x 2x 5x 23
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 23x 23 = 5290
Therefore, the value for common factors is 5290.
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 = 406197728400/(1x5290)
LCM = 406197728400/5290
LCM = 76785960
Thus, we can understand that the LCM of 690,989,647,920 is 76785960.
LCM of two or more Numbers Calculation Examples
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FAQs on LCM of 690, 989, 647, 920
1. What is the LCM of 690, 989, 647, 920?
Answer: LCM of 690, 989, 647, 920 is 76785960.
2. How to calculate the LCM of 690, 989, 647, 920?
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 690, 989, 647, 920.
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}.