LCM of 821, 987, 840, 649
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 821, 987, 840, 649 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 821, 987, 840, 649. So, keep reading to learn more.
Given numbers are 821,987,840,649
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 821,987,840,649 is 21036088920.
Find LCM of 821,987,840,649 with Prime Factorization
| 3 | 821, 987, 840, 649 |
| 7 | 821, 329, 280, 649 |
| 821, 47, 40, 649 |
Multiply the prime numbers at the bottom and the left side.
3 x 7 x 821 x 47 x 40 x 649 = 21036088920
Therefore, the lowest common multiple of 821,987,840,649 is 21036088920.
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.
821 x 987 x 840 x 649 = 441757867320
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.
821 : 1, 821
987 : 1, 3, 7, 21, 47, 141, 329, 987
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
649 : 1, 11, 59, 649
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 821,987,840,649, is 1.
Now, the common factors can be found like this.
821:821
987:3x 7x 47
840:2x 2x 2x 3x 5x 7
649:11x 59
From this, we can see that the common factors because they appear for more than two numbers. So, just multiply them all together.
3x 7 = 21
Therefore, the value for common factors is 21.
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 = 441757867320/(1x21)
LCM = 441757867320/21
LCM = 21036088920
Thus, we can understand that the LCM of 821,987,840,649 is 21036088920.
LCM of two or more Numbers Calculation Examples
Here are some samples of LCM of two or more Numbers calculations.
FAQs on LCM of 821, 987, 840, 649
1. What is the LCM of 821, 987, 840, 649?
Answer: LCM of 821, 987, 840, 649 is 21036088920.
2. How to calculate the LCM of 821, 987, 840, 649?
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 821, 987, 840, 649.
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}.