LCM of 840, 169, 780
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 840, 169, 780 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 840, 169, 780. So, keep reading to learn more.
Given numbers are 840,169,780
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 840,169,780 is 141960.
Find LCM of 840,169,780 with Prime Factorization
| 2 | 840, 169, 780 |
| 2 | 420, 169, 390 |
| 3 | 210, 169, 195 |
| 5 | 70, 169, 65 |
| 13 | 14, 169, 13 |
| 14, 1, 13 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 3 x 5 x 13 x 14 x 1 x 13 = 141960
Therefore, the lowest common multiple of 840,169,780 is 141960.
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.
840 x 169 x 780 = 110728800
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.
840 : 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 28, 30, 35, 40, 42, 56, 60, 70, 84, 105, 120, 140, 168, 210, 280, 420, 840
169 : 1, 13, 169
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
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 840,169,780, is 1.
Now, the common factors can be found like this.
840:2x 2x 2x 3x 5x 7
169:13x 13
780:2x 2x 3x 5x 13
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 3x 5x 13 = 780
Therefore, the value for common factors is 780.
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 = 110728800/(1x780)
LCM = 110728800/780
LCM = 141960
Thus, we can understand that the LCM of 840,169,780 is 141960.
LCM of two or more Numbers Calculation Examples
Here are some samples of LCM of two or more Numbers calculations.
FAQs on LCM of 840, 169, 780
1. What is the LCM of 840, 169, 780?
Answer: LCM of 840, 169, 780 is 141960.
2. How to calculate the LCM of 840, 169, 780?
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 840, 169, 780.
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}.