LCM of 172, 120, 420, 791
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 172, 120, 420, 791 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 172, 120, 420, 791. So, keep reading to learn more.
Given numbers are 172,120,420,791
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 172,120,420,791 is 4081560.
Find LCM of 172,120,420,791 with Prime Factorization
| 2 | 172, 120, 420, 791 |
| 2 | 86, 60, 210, 791 |
| 3 | 43, 30, 105, 791 |
| 5 | 43, 10, 35, 791 |
| 7 | 43, 2, 7, 791 |
| 43, 2, 1, 113 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 3 x 5 x 7 x 43 x 2 x 1 x 113 = 4081560
Therefore, the lowest common multiple of 172,120,420,791 is 4081560.
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.
172 x 120 x 420 x 791 = 6857020800
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.
172 : 1, 2, 4, 43, 86, 172
120 : 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 120
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
791 : 1, 7, 113, 791
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 172,120,420,791, is 1.
Now, the common factors can be found like this.
172:2x 2x 43
120:2x 2x 2x 3x 5
420:2x 2x 3x 5x 7
791:7x 113
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 3x 5x 7 = 1680
Therefore, the value for common factors is 1680.
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 = 6857020800/(1x1680)
LCM = 6857020800/1680
LCM = 4081560
Thus, we can understand that the LCM of 172,120,420,791 is 4081560.
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FAQs on LCM of 172, 120, 420, 791
1. What is the LCM of 172, 120, 420, 791?
Answer: LCM of 172, 120, 420, 791 is 4081560.
2. How to calculate the LCM of 172, 120, 420, 791?
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 172, 120, 420, 791.
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}.