LCM of 661, 695, 128, 720
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 661, 695, 128, 720 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 661, 695, 128, 720. So, keep reading to learn more.
Given numbers are 661,695,128,720
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 661,695,128,720 is 529223040.
Find LCM of 661,695,128,720 with Prime Factorization
| 2 | 661, 695, 128, 720 |
| 2 | 661, 695, 64, 360 |
| 2 | 661, 695, 32, 180 |
| 2 | 661, 695, 16, 90 |
| 5 | 661, 695, 8, 45 |
| 661, 139, 8, 9 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 2 x 2 x 5 x 661 x 139 x 8 x 9 = 529223040
Therefore, the lowest common multiple of 661,695,128,720 is 529223040.
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.
661 x 695 x 128 x 720 = 42337843200
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.
661 : 1, 661
695 : 1, 5, 139, 695
128 : 1, 2, 4, 8, 16, 32, 64, 128
720 : 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 30, 36, 40, 45, 48, 60, 72, 80, 90, 120, 144, 180, 240, 360, 720
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 661,695,128,720, is 1.
Now, the common factors can be found like this.
661:661
695:5x 139
128:2x 2x 2x 2x 2x 2x 2
720:2x 2x 2x 2x 3x 3x 5
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 2x 5 = 80
Therefore, the value for common factors is 80.
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 = 42337843200/(1x80)
LCM = 42337843200/80
LCM = 529223040
Thus, we can understand that the LCM of 661,695,128,720 is 529223040.
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FAQs on LCM of 661, 695, 128, 720
1. What is the LCM of 661, 695, 128, 720?
Answer: LCM of 661, 695, 128, 720 is 529223040.
2. How to calculate the LCM of 661, 695, 128, 720?
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 661, 695, 128, 720.
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}.