LCM of 320, 280, 840, 642
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 320, 280, 840, 642 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 320, 280, 840, 642. So, keep reading to learn more.
Given numbers are 320,280,840,642
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 320,280,840,642 is 719040.
Find LCM of 320,280,840,642 with Prime Factorization
| 2 | 320, 280, 840, 642 |
| 2 | 160, 140, 420, 321 |
| 2 | 80, 70, 210, 321 |
| 3 | 40, 35, 105, 321 |
| 5 | 40, 35, 35, 107 |
| 7 | 8, 7, 7, 107 |
| 8, 1, 1, 107 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 2 x 3 x 5 x 7 x 8 x 1 x 1 x 107 = 719040
Therefore, the lowest common multiple of 320,280,840,642 is 719040.
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.
320 x 280 x 840 x 642 = 48319488000
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.
320 : 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 160, 320
280 : 1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280
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
642 : 1, 2, 3, 6, 107, 214, 321, 642
2 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 320,280,840,642, is 2.
Now, the common factors can be found like this.
320:2x 2x 2x 2x 2x 2x 5
280:2x 2x 2x 5x 7
840:2x 2x 2x 3x 5x 7
642:2x 3x 107
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 3x 5x 5x 7 = 33600
Therefore, the value for common factors is 33600.
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 = 48319488000/(2x33600)
LCM = 48319488000/67200
LCM = 719040
Thus, we can understand that the LCM of 320,280,840,642 is 719040.
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FAQs on LCM of 320, 280, 840, 642
1. What is the LCM of 320, 280, 840, 642?
Answer: LCM of 320, 280, 840, 642 is 719040.
2. How to calculate the LCM of 320, 280, 840, 642?
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 320, 280, 840, 642.
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}.