LCM of 645, 720, 720
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 645, 720, 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 645, 720, 720. So, keep reading to learn more.
Given numbers are 645,720,720
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 645,720,720 is 30960.
Find LCM of 645,720,720 with Prime Factorization
| 2 | 645, 720, 720 |
| 2 | 645, 360, 360 |
| 2 | 645, 180, 180 |
| 2 | 645, 90, 90 |
| 3 | 645, 45, 45 |
| 3 | 215, 15, 15 |
| 5 | 215, 5, 5 |
| 43, 1, 1 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 2 x 2 x 3 x 3 x 5 x 43 x 1 x 1 = 30960
Therefore, the lowest common multiple of 645,720,720 is 30960.
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.
645 x 720 x 720 = 334368000
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.
645 : 1, 3, 5, 15, 43, 129, 215, 645
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
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
15 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 645,720,720, is 15.
Now, the common factors can be found like this.
645:3x 5x 43
720:2x 2x 2x 2x 3x 3x 5
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 3x 3x 5 = 720
Therefore, the value for common factors is 720.
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 = 334368000/(15x720)
LCM = 334368000/10800
LCM = 30960
Thus, we can understand that the LCM of 645,720,720 is 30960.
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FAQs on LCM of 645, 720, 720
1. What is the LCM of 645, 720, 720?
Answer: LCM of 645, 720, 720 is 30960.
2. How to calculate the LCM of 645, 720, 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 645, 720, 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}.