LCM of 221, 169, 420, 855
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 221, 169, 420, 855 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 221, 169, 420, 855. So, keep reading to learn more.
Given numbers are 221,169,420,855
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 221,169,420,855 is 68779620.
Find LCM of 221,169,420,855 with Prime Factorization
| 3 | 221, 169, 420, 855 |
| 5 | 221, 169, 140, 285 |
| 13 | 221, 169, 28, 57 |
| 17, 13, 28, 57 |
Multiply the prime numbers at the bottom and the left side.
3 x 5 x 13 x 17 x 13 x 28 x 57 = 68779620
Therefore, the lowest common multiple of 221,169,420,855 is 68779620.
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.
221 x 169 x 420 x 855 = 13412025900
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.
221 : 1, 13, 17, 221
169 : 1, 13, 169
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
855 : 1, 3, 5, 9, 15, 19, 45, 57, 95, 171, 285, 855
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 221,169,420,855, is 1.
Now, the common factors can be found like this.
221:13x 17
169:13x 13
420:2x 2x 3x 5x 7
855:3x 3x 5x 19
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 13 = 195
Therefore, the value for common factors is 195.
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 = 13412025900/(1x195)
LCM = 13412025900/195
LCM = 68779620
Thus, we can understand that the LCM of 221,169,420,855 is 68779620.
LCM of two or more Numbers Calculation Examples
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FAQs on LCM of 221, 169, 420, 855
1. What is the LCM of 221, 169, 420, 855?
Answer: LCM of 221, 169, 420, 855 is 68779620.
2. How to calculate the LCM of 221, 169, 420, 855?
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 221, 169, 420, 855.
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}.