LCM of 642, 278, 140, 220
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 642, 278, 140, 220 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 642, 278, 140, 220. So, keep reading to learn more.
Given numbers are 642,278,140,220
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 642,278,140,220 is 68713260.
Find LCM of 642,278,140,220 with Prime Factorization
| 2 | 642, 278, 140, 220 |
| 2 | 321, 139, 70, 110 |
| 5 | 321, 139, 35, 55 |
| 321, 139, 7, 11 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 5 x 321 x 139 x 7 x 11 = 68713260
Therefore, the lowest common multiple of 642,278,140,220 is 68713260.
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.
642 x 278 x 140 x 220 = 5497060800
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.
642 : 1, 2, 3, 6, 107, 214, 321, 642
278 : 1, 2, 139, 278
140 : 1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140
220 : 1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 220
2 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 642,278,140,220, is 2.
Now, the common factors can be found like this.
642:2x 3x 107
278:2x 139
140:2x 2x 5x 7
220:2x 2x 5x 11
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 5 = 40
Therefore, the value for common factors is 40.
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 = 5497060800/(2x40)
LCM = 5497060800/80
LCM = 68713260
Thus, we can understand that the LCM of 642,278,140,220 is 68713260.
LCM of two or more Numbers Calculation Examples
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FAQs on LCM of 642, 278, 140, 220
1. What is the LCM of 642, 278, 140, 220?
Answer: LCM of 642, 278, 140, 220 is 68713260.
2. How to calculate the LCM of 642, 278, 140, 220?
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 642, 278, 140, 220.
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}.