LCM of 720, 770, 745, 640, 620
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 720, 770, 745, 640, 620 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 720, 770, 745, 640, 620. So, keep reading to learn more.
Given numbers are 720,770,745,640,620
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 720,770,745,640,620 is 2048618880.
Find LCM of 720,770,745,640,620 with Prime Factorization
| 2 | 720, 770, 745, 640, 620 |
| 2 | 360, 385, 745, 320, 310 |
| 2 | 180, 385, 745, 160, 155 |
| 2 | 90, 385, 745, 80, 155 |
| 5 | 45, 385, 745, 40, 155 |
| 9, 77, 149, 8, 31 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 2 x 2 x 5 x 9 x 77 x 149 x 8 x 31 = 2048618880
Therefore, the lowest common multiple of 720,770,745,640,620 is 2048618880.
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.
720 x 770 x 745 x 640 x 620 = 163889510400000
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.
720 : 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 30, 36, 40, 45, 48, 60, 72, 80, 90, 120, 144, 180, 240, 360, 720
770 : 1, 2, 5, 7, 10, 11, 14, 22, 35, 55, 70, 77, 110, 154, 385, 770
745 : 1, 5, 149, 745
640 : 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640
620 : 1, 2, 4, 5, 10, 20, 31, 62, 124, 155, 310, 620
5 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 720,770,745,640,620, is 5.
Now, the common factors can be found like this.
720:2x 2x 2x 2x 3x 3x 5
770:2x 5x 7x 11
745:5x 149
640:2x 2x 2x 2x 2x 2x 2x 5
620:2x 2x 5x 31
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 2x 2x 5x 5x 5 = 16000
Therefore, the value for common factors is 16000.
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 = 163889510400000/(5x16000)
LCM = 163889510400000/80000
LCM = 2048618880
Thus, we can understand that the LCM of 720,770,745,640,620 is 2048618880.
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FAQs on LCM of 720, 770, 745, 640, 620
1. What is the LCM of 720, 770, 745, 640, 620?
Answer: LCM of 720, 770, 745, 640, 620 is 2048618880.
2. How to calculate the LCM of 720, 770, 745, 640, 620?
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 720, 770, 745, 640, 620.
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}.