LCM of 972, 691, 686, 420
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 972, 691, 686, 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 972, 691, 686, 420. So, keep reading to learn more.
Given numbers are 972,691,686,420
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 972,691,686,420 is 1151883180.
Find LCM of 972,691,686,420 with Prime Factorization
| 2 | 972, 691, 686, 420 |
| 2 | 486, 691, 343, 210 |
| 3 | 243, 691, 343, 105 |
| 7 | 81, 691, 343, 35 |
| 81, 691, 49, 5 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 3 x 7 x 81 x 691 x 49 x 5 = 1151883180
Therefore, the lowest common multiple of 972,691,686,420 is 1151883180.
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.
972 x 691 x 686 x 420 = 193516374240
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.
972 : 1, 2, 3, 4, 6, 9, 12, 18, 27, 36, 54, 81, 108, 162, 243, 324, 486, 972
691 : 1, 691
686 : 1, 2, 7, 14, 49, 98, 343, 686
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 972,691,686,420, is 1.
Now, the common factors can be found like this.
972:2x 2x 3x 3x 3x 3x 3
691:691
686:2x 7x 7x 7
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 2x 3x 7 = 168
Therefore, the value for common factors is 168.
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 = 193516374240/(1x168)
LCM = 193516374240/168
LCM = 1151883180
Thus, we can understand that the LCM of 972,691,686,420 is 1151883180.
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FAQs on LCM of 972, 691, 686, 420
1. What is the LCM of 972, 691, 686, 420?
Answer: LCM of 972, 691, 686, 420 is 1151883180.
2. How to calculate the LCM of 972, 691, 686, 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 972, 691, 686, 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}.