LCM of 561, 768, 420, 172
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 561, 768, 420, 172 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 561, 768, 420, 172. So, keep reading to learn more.
Given numbers are 561,768,420,172
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 561,768,420,172 is 216142080.
Find LCM of 561,768,420,172 with Prime Factorization
| 2 | 561, 768, 420, 172 |
| 2 | 561, 384, 210, 86 |
| 3 | 561, 192, 105, 43 |
| 187, 64, 35, 43 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 3 x 187 x 64 x 35 x 43 = 216142080
Therefore, the lowest common multiple of 561,768,420,172 is 216142080.
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.
561 x 768 x 420 x 172 = 31124459520
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.
561 : 1, 3, 11, 17, 33, 51, 187, 561
768 : 1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 128, 192, 256, 384, 768
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
172 : 1, 2, 4, 43, 86, 172
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 561,768,420,172, is 1.
Now, the common factors can be found like this.
561:3x 11x 17
768:2x 2x 2x 2x 2x 2x 2x 2x 3
420:2x 2x 3x 5x 7
172:2x 2x 43
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 3 = 144
Therefore, the value for common factors is 144.
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 = 31124459520/(1x144)
LCM = 31124459520/144
LCM = 216142080
Thus, we can understand that the LCM of 561,768,420,172 is 216142080.
LCM of two or more Numbers Calculation Examples
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FAQs on LCM of 561, 768, 420, 172
1. What is the LCM of 561, 768, 420, 172?
Answer: LCM of 561, 768, 420, 172 is 216142080.
2. How to calculate the LCM of 561, 768, 420, 172?
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 561, 768, 420, 172.
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}.