LCM of 72, 84, 85, 28, 642
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 72, 84, 85, 28, 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 72, 84, 85, 28, 642. So, keep reading to learn more.
Given numbers are 72,84,85,28,642
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 72,84,85,28,642 is 4583880.
Find LCM of 72,84,85,28,642 with Prime Factorization
| 2 | 72, 84, 85, 28, 642 |
| 2 | 36, 42, 85, 14, 321 |
| 3 | 18, 21, 85, 7, 321 |
| 7 | 6, 7, 85, 7, 107 |
| 6, 1, 85, 1, 107 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 3 x 7 x 6 x 1 x 85 x 1 x 107 = 4583880
Therefore, the lowest common multiple of 72,84,85,28,642 is 4583880.
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.
72 x 84 x 85 x 28 x 642 = 9241102080
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.
72 : 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
84 : 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84
85 : 1, 5, 17, 85
28 : 1, 2, 4, 7, 14, 28
642 : 1, 2, 3, 6, 107, 214, 321, 642
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 72,84,85,28,642, is 1.
Now, the common factors can be found like this.
72:2x 2x 2x 3x 3
84:2x 2x 3x 7
85:5x 17
28:2x 2x 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 3x 3x 7 = 2016
Therefore, the value for common factors is 2016.
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 = 9241102080/(1x2016)
LCM = 9241102080/2016
LCM = 4583880
Thus, we can understand that the LCM of 72,84,85,28,642 is 4583880.
LCM of two or more Numbers Calculation Examples
Here are some samples of LCM of two or more Numbers calculations.
FAQs on LCM of 72, 84, 85, 28, 642
1. What is the LCM of 72, 84, 85, 28, 642?
Answer: LCM of 72, 84, 85, 28, 642 is 4583880.
2. How to calculate the LCM of 72, 84, 85, 28, 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 72, 84, 85, 28, 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}.