LCM of 840, 128, 721, 185
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 840, 128, 721, 185 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 840, 128, 721, 185. So, keep reading to learn more.
Given numbers are 840,128,721,185
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 840,128,721,185 is 51219840.
Find LCM of 840,128,721,185 with Prime Factorization
| 2 | 840, 128, 721, 185 |
| 2 | 420, 64, 721, 185 |
| 2 | 210, 32, 721, 185 |
| 5 | 105, 16, 721, 185 |
| 7 | 21, 16, 721, 37 |
| 3, 16, 103, 37 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 2 x 5 x 7 x 3 x 16 x 103 x 37 = 51219840
Therefore, the lowest common multiple of 840,128,721,185 is 51219840.
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.
840 x 128 x 721 x 185 = 14341555200
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.
840 : 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 28, 30, 35, 40, 42, 56, 60, 70, 84, 105, 120, 140, 168, 210, 280, 420, 840
128 : 1, 2, 4, 8, 16, 32, 64, 128
721 : 1, 7, 103, 721
185 : 1, 5, 37, 185
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 840,128,721,185, is 1.
Now, the common factors can be found like this.
840:2x 2x 2x 3x 5x 7
128:2x 2x 2x 2x 2x 2x 2
721:7x 103
185:5x 37
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 5x 7 = 280
Therefore, the value for common factors is 280.
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 = 14341555200/(1x280)
LCM = 14341555200/280
LCM = 51219840
Thus, we can understand that the LCM of 840,128,721,185 is 51219840.
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FAQs on LCM of 840, 128, 721, 185
1. What is the LCM of 840, 128, 721, 185?
Answer: LCM of 840, 128, 721, 185 is 51219840.
2. How to calculate the LCM of 840, 128, 721, 185?
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 840, 128, 721, 185.
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}.