LCM of 765, 721, 788, 420
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 765, 721, 788, 420 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 765, 721, 788, 420. So, keep reading to learn more.
Given numbers are 765,721,788,420
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 765,721,788,420 is 434633220.
Find LCM of 765,721,788,420 with Prime Factorization
| 2 | 765, 721, 788, 420 |
| 2 | 765, 721, 394, 210 |
| 3 | 765, 721, 197, 105 |
| 5 | 255, 721, 197, 35 |
| 7 | 51, 721, 197, 7 |
| 51, 103, 197, 1 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 3 x 5 x 7 x 51 x 103 x 197 x 1 = 434633220
Therefore, the lowest common multiple of 765,721,788,420 is 434633220.
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.
765 x 721 x 788 x 420 = 182545952400
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.
765 : 1, 3, 5, 9, 15, 17, 45, 51, 85, 153, 255, 765
721 : 1, 7, 103, 721
788 : 1, 2, 4, 197, 394, 788
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
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 765,721,788,420, is 1.
Now, the common factors can be found like this.
765:3x 3x 5x 17
721:7x 103
788:2x 2x 197
420:2x 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 3x 5x 7 = 420
Therefore, the value for common factors is 420.
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 = 182545952400/(1x420)
LCM = 182545952400/420
LCM = 434633220
Thus, we can understand that the LCM of 765,721,788,420 is 434633220.
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FAQs on LCM of 765, 721, 788, 420
1. What is the LCM of 765, 721, 788, 420?
Answer: LCM of 765, 721, 788, 420 is 434633220.
2. How to calculate the LCM of 765, 721, 788, 420?
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 765, 721, 788, 420.
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}.