LCM of 646, 278, 140, 840
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 646, 278, 140, 840 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 646, 278, 140, 840. So, keep reading to learn more.
Given numbers are 646,278,140,840
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 646,278,140,840 is 37713480.
Find LCM of 646,278,140,840 with Prime Factorization
| 2 | 646, 278, 140, 840 |
| 2 | 323, 139, 70, 420 |
| 5 | 323, 139, 35, 210 |
| 7 | 323, 139, 7, 42 |
| 323, 139, 1, 6 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 5 x 7 x 323 x 139 x 1 x 6 = 37713480
Therefore, the lowest common multiple of 646,278,140,840 is 37713480.
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.
646 x 278 x 140 x 840 = 21119548800
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.
646 : 1, 2, 17, 19, 34, 38, 323, 646
278 : 1, 2, 139, 278
140 : 1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140
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
2 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 646,278,140,840, is 2.
Now, the common factors can be found like this.
646:2x 17x 19
278:2x 139
140:2x 2x 5x 7
840:2x 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 5x 7 = 280
Therefore, the value for common factors is 280.
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 = 21119548800/(2x280)
LCM = 21119548800/560
LCM = 37713480
Thus, we can understand that the LCM of 646,278,140,840 is 37713480.
LCM of two or more Numbers Calculation Examples
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FAQs on LCM of 646, 278, 140, 840
1. What is the LCM of 646, 278, 140, 840?
Answer: LCM of 646, 278, 140, 840 is 37713480.
2. How to calculate the LCM of 646, 278, 140, 840?
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 646, 278, 140, 840.
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}.