LCM of 278, 420, 240, 646
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 278, 420, 240, 646 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 278, 420, 240, 646. So, keep reading to learn more.
Given numbers are 278,420,240,646
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 278,420,240,646 is 75426960.
Find LCM of 278,420,240,646 with Prime Factorization
| 2 | 278, 420, 240, 646 |
| 2 | 139, 210, 120, 323 |
| 3 | 139, 105, 60, 323 |
| 5 | 139, 35, 20, 323 |
| 139, 7, 4, 323 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 3 x 5 x 139 x 7 x 4 x 323 = 75426960
Therefore, the lowest common multiple of 278,420,240,646 is 75426960.
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.
278 x 420 x 240 x 646 = 18102470400
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.
278 : 1, 2, 139, 278
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
240 : 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 40, 48, 60, 80, 120, 240
646 : 1, 2, 17, 19, 34, 38, 323, 646
2 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 278,420,240,646, is 2.
Now, the common factors can be found like this.
278:2x 139
420:2x 2x 3x 5x 7
240:2x 2x 2x 2x 3x 5
646:2x 17x 19
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 5 = 120
Therefore, the value for common factors is 120.
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 = 18102470400/(2x120)
LCM = 18102470400/240
LCM = 75426960
Thus, we can understand that the LCM of 278,420,240,646 is 75426960.
LCM of two or more Numbers Calculation Examples
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FAQs on LCM of 278, 420, 240, 646
1. What is the LCM of 278, 420, 240, 646?
Answer: LCM of 278, 420, 240, 646 is 75426960.
2. How to calculate the LCM of 278, 420, 240, 646?
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 278, 420, 240, 646.
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}.