LCM of 155, 781, 128, 720
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 155, 781, 128, 720 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 155, 781, 128, 720. So, keep reading to learn more.
Given numbers are 155,781,128,720
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 155,781,128,720 is 139455360.
Find LCM of 155,781,128,720 with Prime Factorization
| 2 | 155, 781, 128, 720 |
| 2 | 155, 781, 64, 360 |
| 2 | 155, 781, 32, 180 |
| 2 | 155, 781, 16, 90 |
| 5 | 155, 781, 8, 45 |
| 31, 781, 8, 9 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 2 x 2 x 5 x 31 x 781 x 8 x 9 = 139455360
Therefore, the lowest common multiple of 155,781,128,720 is 139455360.
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.
155 x 781 x 128 x 720 = 11156428800
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.
155 : 1, 5, 31, 155
781 : 1, 11, 71, 781
128 : 1, 2, 4, 8, 16, 32, 64, 128
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
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 155,781,128,720, is 1.
Now, the common factors can be found like this.
155:5x 31
781:11x 71
128:2x 2x 2x 2x 2x 2x 2
720:2x 2x 2x 2x 3x 3x 5
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 5 = 80
Therefore, the value for common factors is 80.
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 = 11156428800/(1x80)
LCM = 11156428800/80
LCM = 139455360
Thus, we can understand that the LCM of 155,781,128,720 is 139455360.
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FAQs on LCM of 155, 781, 128, 720
1. What is the LCM of 155, 781, 128, 720?
Answer: LCM of 155, 781, 128, 720 is 139455360.
2. How to calculate the LCM of 155, 781, 128, 720?
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 155, 781, 128, 720.
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}.