LCM of 781, 209, 221, 399
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 781, 209, 221, 399 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 781, 209, 221, 399. So, keep reading to learn more.
Given numbers are 781,209,221,399
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 781,209,221,399 is 68867799.
Find LCM of 781,209,221,399 with Prime Factorization
| 11 | 781, 209, 221, 399 |
| 19 | 71, 19, 221, 399 |
| 71, 1, 221, 21 |
Multiply the prime numbers at the bottom and the left side.
11 x 19 x 71 x 1 x 221 x 21 = 68867799
Therefore, the lowest common multiple of 781,209,221,399 is 68867799.
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.
781 x 209 x 221 x 399 = 14393369991
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.
781 : 1, 11, 71, 781
209 : 1, 11, 19, 209
221 : 1, 13, 17, 221
399 : 1, 3, 7, 19, 21, 57, 133, 399
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 781,209,221,399, is 1.
Now, the common factors can be found like this.
781:11x 71
209:11x 19
221:13x 17
399:3x 7x 19
From this, we can see that the common factors because they appear for more than two numbers. So, just multiply them all together.
11x 19 = 209
Therefore, the value for common factors is 209.
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 = 14393369991/(1x209)
LCM = 14393369991/209
LCM = 68867799
Thus, we can understand that the LCM of 781,209,221,399 is 68867799.
LCM of two or more Numbers Calculation Examples
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FAQs on LCM of 781, 209, 221, 399
1. What is the LCM of 781, 209, 221, 399?
Answer: LCM of 781, 209, 221, 399 is 68867799.
2. How to calculate the LCM of 781, 209, 221, 399?
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 781, 209, 221, 399.
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}.