LCM of 687, 991, 820, 665, 705
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 687, 991, 820, 665, 705 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 687, 991, 820, 665, 705. So, keep reading to learn more.
Given numbers are 687,991,820,665,705
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 687,991,820,665,705 is 3489745394940.
Find LCM of 687,991,820,665,705 with Prime Factorization
| 3 | 687, 991, 820, 665, 705 |
| 5 | 229, 991, 820, 665, 235 |
| 229, 991, 164, 133, 47 |
Multiply the prime numbers at the bottom and the left side.
3 x 5 x 229 x 991 x 164 x 133 x 47 = 3489745394940
Therefore, the lowest common multiple of 687,991,820,665,705 is 3489745394940.
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.
687 x 991 x 820 x 665 x 705 = 261730904620500
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.
687 : 1, 3, 229, 687
991 : 1, 991
820 : 1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820
665 : 1, 5, 7, 19, 35, 95, 133, 665
705 : 1, 3, 5, 15, 47, 141, 235, 705
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 687,991,820,665,705, is 1.
Now, the common factors can be found like this.
687:3x 229
991:991
820:2x 2x 5x 41
665:5x 7x 19
705:3x 5x 47
From this, we can see that the common factors because they appear for more than two numbers. So, just multiply them all together.
3x 5x 5 = 75
Therefore, the value for common factors is 75.
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 = 261730904620500/(1x75)
LCM = 261730904620500/75
LCM = 3489745394940
Thus, we can understand that the LCM of 687,991,820,665,705 is 3489745394940.
LCM of two or more Numbers Calculation Examples
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FAQs on LCM of 687, 991, 820, 665, 705
1. What is the LCM of 687, 991, 820, 665, 705?
Answer: LCM of 687, 991, 820, 665, 705 is 3489745394940.
2. How to calculate the LCM of 687, 991, 820, 665, 705?
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 687, 991, 820, 665, 705.
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}.