LCM of 688, 390, 988, 317
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 688, 390, 988, 317 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 688, 390, 988, 317. So, keep reading to learn more.
Given numbers are 688,390,988,317
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 688,390,988,317 is 808045680.
Find LCM of 688,390,988,317 with Prime Factorization
| 2 | 688, 390, 988, 317 |
| 2 | 344, 195, 494, 317 |
| 13 | 172, 195, 247, 317 |
| 172, 15, 19, 317 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 13 x 172 x 15 x 19 x 317 = 808045680
Therefore, the lowest common multiple of 688,390,988,317 is 808045680.
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.
688 x 390 x 988 x 317 = 84036750720
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.
688 : 1, 2, 4, 8, 16, 43, 86, 172, 344, 688
390 : 1, 2, 3, 5, 6, 10, 13, 15, 26, 30, 39, 65, 78, 130, 195, 390
988 : 1, 2, 4, 13, 19, 26, 38, 52, 76, 247, 494, 988
317 : 1, 317
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 688,390,988,317, is 1.
Now, the common factors can be found like this.
688:2x 2x 2x 2x 43
390:2x 3x 5x 13
988:2x 2x 13x 19
317:317
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 13 = 104
Therefore, the value for common factors is 104.
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 = 84036750720/(1x104)
LCM = 84036750720/104
LCM = 808045680
Thus, we can understand that the LCM of 688,390,988,317 is 808045680.
LCM of two or more Numbers Calculation Examples
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FAQs on LCM of 688, 390, 988, 317
1. What is the LCM of 688, 390, 988, 317?
Answer: LCM of 688, 390, 988, 317 is 808045680.
2. How to calculate the LCM of 688, 390, 988, 317?
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 688, 390, 988, 317.
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}.