LCM of 121, 868, 140, 720
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 121, 868, 140, 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 121, 868, 140, 720. So, keep reading to learn more.
Given numbers are 121,868,140,720
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 121,868,140,720 is 18905040.
Find LCM of 121,868,140,720 with Prime Factorization
| 2 | 121, 868, 140, 720 |
| 2 | 121, 434, 70, 360 |
| 5 | 121, 217, 35, 180 |
| 7 | 121, 217, 7, 36 |
| 121, 31, 1, 36 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 5 x 7 x 121 x 31 x 1 x 36 = 18905040
Therefore, the lowest common multiple of 121,868,140,720 is 18905040.
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.
121 x 868 x 140 x 720 = 10586822400
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.
121 : 1, 11, 121
868 : 1, 2, 4, 7, 14, 28, 31, 62, 124, 217, 434, 868
140 : 1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140
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 121,868,140,720, is 1.
Now, the common factors can be found like this.
121:11x 11
868:2x 2x 7x 31
140:2x 2x 5x 7
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 5x 7 = 560
Therefore, the value for common factors is 560.
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 = 10586822400/(1x560)
LCM = 10586822400/560
LCM = 18905040
Thus, we can understand that the LCM of 121,868,140,720 is 18905040.
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FAQs on LCM of 121, 868, 140, 720
1. What is the LCM of 121, 868, 140, 720?
Answer: LCM of 121, 868, 140, 720 is 18905040.
2. How to calculate the LCM of 121, 868, 140, 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 121, 868, 140, 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}.