LCM of 561, 780, 387, 221
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 561, 780, 387, 221 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, 780, 387, 221. So, keep reading to learn more.
Given numbers are 561,780,387,221
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 561,780,387,221 is 18815940.
Find LCM of 561,780,387,221 with Prime Factorization
| 3 | 561, 780, 387, 221 |
| 13 | 187, 260, 129, 221 |
| 17 | 187, 20, 129, 17 |
| 11, 20, 129, 1 |
Multiply the prime numbers at the bottom and the left side.
3 x 13 x 17 x 11 x 20 x 129 x 1 = 18815940
Therefore, the lowest common multiple of 561,780,387,221 is 18815940.
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 780 x 387 x 221 = 37424904660
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
780 : 1, 2, 3, 4, 5, 6, 10, 12, 13, 15, 20, 26, 30, 39, 52, 60, 65, 78, 130, 156, 195, 260, 390, 780
387 : 1, 3, 9, 43, 129, 387
221 : 1, 13, 17, 221
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 561,780,387,221, is 1.
Now, the common factors can be found like this.
561:3x 11x 17
780:2x 2x 3x 5x 13
387:3x 3x 43
221:13x 17
From this, we can see that the common factors because they appear for more than two numbers. So, just multiply them all together.
3x 3x 13x 17 = 1989
Therefore, the value for common factors is 1989.
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 = 37424904660/(1x1989)
LCM = 37424904660/1989
LCM = 18815940
Thus, we can understand that the LCM of 561,780,387,221 is 18815940.
LCM of two or more Numbers Calculation Examples
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FAQs on LCM of 561, 780, 387, 221
1. What is the LCM of 561, 780, 387, 221?
Answer: LCM of 561, 780, 387, 221 is 18815940.
2. How to calculate the LCM of 561, 780, 387, 221?
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, 780, 387, 221.
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}.