LCM of 980, 320, 420, 784
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 980, 320, 420, 784 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 980, 320, 420, 784. So, keep reading to learn more.
Given numbers are 980,320,420,784
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 980,320,420,784 is 47040.
Find LCM of 980,320,420,784 with Prime Factorization
| 2 | 980, 320, 420, 784 |
| 2 | 490, 160, 210, 392 |
| 2 | 245, 80, 105, 196 |
| 2 | 245, 40, 105, 98 |
| 5 | 245, 20, 105, 49 |
| 7 | 49, 4, 21, 49 |
| 7 | 7, 4, 3, 7 |
| 1, 4, 3, 1 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 2 x 2 x 5 x 7 x 7 x 1 x 4 x 3 x 1 = 47040
Therefore, the lowest common multiple of 980,320,420,784 is 47040.
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.
980 x 320 x 420 x 784 = 103262208000
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.
980 : 1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 140, 196, 245, 490, 980
320 : 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 160, 320
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
784 : 1, 2, 4, 7, 8, 14, 16, 28, 49, 56, 98, 112, 196, 392, 784
4 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 980,320,420,784, is 4.
Now, the common factors can be found like this.
980:2x 2x 5x 7x 7
320:2x 2x 2x 2x 2x 2x 5
420:2x 2x 3x 5x 7
784:2x 2x 2x 2x 7x 7
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 2x 2x 2x 2x 5x 5x 7x 7x 7 = 548800
Therefore, the value for common factors is 548800.
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 = 103262208000/(4x548800)
LCM = 103262208000/2195200
LCM = 47040
Thus, we can understand that the LCM of 980,320,420,784 is 47040.
LCM of two or more Numbers Calculation Examples
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FAQs on LCM of 980, 320, 420, 784
1. What is the LCM of 980, 320, 420, 784?
Answer: LCM of 980, 320, 420, 784 is 47040.
2. How to calculate the LCM of 980, 320, 420, 784?
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 980, 320, 420, 784.
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}.