LCM of 715, 420, 681, 781
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 715, 420, 681, 781 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 715, 420, 681, 781. So, keep reading to learn more.
Given numbers are 715,420,681,781
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 715,420,681,781 is 967987020.
Find LCM of 715,420,681,781 with Prime Factorization
| 3 | 715, 420, 681, 781 |
| 5 | 715, 140, 227, 781 |
| 11 | 143, 28, 227, 781 |
| 13, 28, 227, 71 |
Multiply the prime numbers at the bottom and the left side.
3 x 5 x 11 x 13 x 28 x 227 x 71 = 967987020
Therefore, the lowest common multiple of 715,420,681,781 is 967987020.
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.
715 x 420 x 681 x 781 = 159717858300
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.
715 : 1, 5, 11, 13, 55, 65, 143, 715
420 : 1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 60, 70, 84, 105, 140, 210, 420
681 : 1, 3, 227, 681
781 : 1, 11, 71, 781
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 715,420,681,781, is 1.
Now, the common factors can be found like this.
715:5x 11x 13
420:2x 2x 3x 5x 7
681:3x 227
781:11x 71
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 11 = 165
Therefore, the value for common factors is 165.
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 = 159717858300/(1x165)
LCM = 159717858300/165
LCM = 967987020
Thus, we can understand that the LCM of 715,420,681,781 is 967987020.
LCM of two or more Numbers Calculation Examples
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FAQs on LCM of 715, 420, 681, 781
1. What is the LCM of 715, 420, 681, 781?
Answer: LCM of 715, 420, 681, 781 is 967987020.
2. How to calculate the LCM of 715, 420, 681, 781?
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 715, 420, 681, 781.
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}.