LCM of 728, 695, 861, 645
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 728, 695, 861, 645 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 728, 695, 861, 645. So, keep reading to learn more.
Given numbers are 728,695,861,645
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 728,695,861,645 is 2676022440.
Find LCM of 728,695,861,645 with Prime Factorization
| 3 | 728, 695, 861, 645 |
| 5 | 728, 695, 287, 215 |
| 7 | 728, 139, 287, 43 |
| 104, 139, 41, 43 |
Multiply the prime numbers at the bottom and the left side.
3 x 5 x 7 x 104 x 139 x 41 x 43 = 2676022440
Therefore, the lowest common multiple of 728,695,861,645 is 2676022440.
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.
728 x 695 x 861 x 645 = 280982356200
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.
728 : 1, 2, 4, 7, 8, 13, 14, 26, 28, 52, 56, 91, 104, 182, 364, 728
695 : 1, 5, 139, 695
861 : 1, 3, 7, 21, 41, 123, 287, 861
645 : 1, 3, 5, 15, 43, 129, 215, 645
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 728,695,861,645, is 1.
Now, the common factors can be found like this.
728:2x 2x 2x 7x 13
695:5x 139
861:3x 7x 41
645:3x 5x 43
From this, we can see that the common factors because they appear for more than two numbers. So, just multiply them all together.
3x 5x 7 = 105
Therefore, the value for common factors is 105.
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 = 280982356200/(1x105)
LCM = 280982356200/105
LCM = 2676022440
Thus, we can understand that the LCM of 728,695,861,645 is 2676022440.
LCM of two or more Numbers Calculation Examples
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FAQs on LCM of 728, 695, 861, 645
1. What is the LCM of 728, 695, 861, 645?
Answer: LCM of 728, 695, 861, 645 is 2676022440.
2. How to calculate the LCM of 728, 695, 861, 645?
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 728, 695, 861, 645.
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}.