LCM of 705, 768, 257, 646, 420
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 705, 768, 257, 646, 420 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 705, 768, 257, 646, 420. So, keep reading to learn more.
Given numbers are 705,768,257,646,420
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 705,768,257,646,420 is 104872776960.
Find LCM of 705,768,257,646,420 with Prime Factorization
| 2 | 705, 768, 257, 646, 420 |
| 2 | 705, 384, 257, 323, 210 |
| 3 | 705, 192, 257, 323, 105 |
| 5 | 235, 64, 257, 323, 35 |
| 47, 64, 257, 323, 7 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 3 x 5 x 47 x 64 x 257 x 323 x 7 = 104872776960
Therefore, the lowest common multiple of 705,768,257,646,420 is 104872776960.
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.
705 x 768 x 257 x 646 x 420 = 37754199705600
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.
705 : 1, 3, 5, 15, 47, 141, 235, 705
768 : 1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 128, 192, 256, 384, 768
257 : 1, 257
646 : 1, 2, 17, 19, 34, 38, 323, 646
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
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 705,768,257,646,420, is 1.
Now, the common factors can be found like this.
705:3x 5x 47
768:2x 2x 2x 2x 2x 2x 2x 2x 3
257:257
646:2x 17x 19
420:2x 2x 3x 5x 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 3x 3x 5 = 360
Therefore, the value for common factors is 360.
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 = 37754199705600/(1x360)
LCM = 37754199705600/360
LCM = 104872776960
Thus, we can understand that the LCM of 705,768,257,646,420 is 104872776960.
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FAQs on LCM of 705, 768, 257, 646, 420
1. What is the LCM of 705, 768, 257, 646, 420?
Answer: LCM of 705, 768, 257, 646, 420 is 104872776960.
2. How to calculate the LCM of 705, 768, 257, 646, 420?
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 705, 768, 257, 646, 420.
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}.