LCM of 120, 306, 391, 690
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 120, 306, 391, 690 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 120, 306, 391, 690. So, keep reading to learn more.
Given numbers are 120,306,391,690
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 120,306,391,690 is 140760.
Find LCM of 120,306,391,690 with Prime Factorization
| 2 | 120, 306, 391, 690 |
| 3 | 60, 153, 391, 345 |
| 5 | 20, 51, 391, 115 |
| 17 | 4, 51, 391, 23 |
| 23 | 4, 3, 23, 23 |
| 4, 3, 1, 1 |
Multiply the prime numbers at the bottom and the left side.
2 x 3 x 5 x 17 x 23 x 4 x 3 x 1 x 1 = 140760
Therefore, the lowest common multiple of 120,306,391,690 is 140760.
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.
120 x 306 x 391 x 690 = 9906688800
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.
120 : 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 120
306 : 1, 2, 3, 6, 9, 17, 18, 34, 51, 102, 153, 306
391 : 1, 17, 23, 391
690 : 1, 2, 3, 5, 6, 10, 15, 23, 30, 46, 69, 115, 138, 230, 345, 690
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 120,306,391,690, is 1.
Now, the common factors can be found like this.
120:2x 2x 2x 3x 5
306:2x 3x 3x 17
391:17x 23
690:2x 3x 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 2x 3x 3x 5x 17x 23 = 70380
Therefore, the value for common factors is 70380.
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 = 9906688800/(1x70380)
LCM = 9906688800/70380
LCM = 140760
Thus, we can understand that the LCM of 120,306,391,690 is 140760.
LCM of two or more Numbers Calculation Examples
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FAQs on LCM of 120, 306, 391, 690
1. What is the LCM of 120, 306, 391, 690?
Answer: LCM of 120, 306, 391, 690 is 140760.
2. How to calculate the LCM of 120, 306, 391, 690?
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 120, 306, 391, 690.
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}.