LCM of 401, 840, 720, 392, 690
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 401, 840, 720, 392, 690 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 401, 840, 720, 392, 690. So, keep reading to learn more.
Given numbers are 401,840,720,392,690
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 401,840,720,392,690 is 325387440.
Find LCM of 401,840,720,392,690 with Prime Factorization
| 2 | 401, 840, 720, 392, 690 |
| 2 | 401, 420, 360, 196, 345 |
| 2 | 401, 210, 180, 98, 345 |
| 3 | 401, 105, 90, 49, 345 |
| 5 | 401, 35, 30, 49, 115 |
| 7 | 401, 7, 6, 49, 23 |
| 401, 1, 6, 7, 23 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 2 x 3 x 5 x 7 x 401 x 1 x 6 x 7 x 23 = 325387440
Therefore, the lowest common multiple of 401,840,720,392,690 is 325387440.
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.
401 x 840 x 720 x 392 x 690 = 65598107904000
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.
401 : 1, 401
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
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
392 : 1, 2, 4, 7, 8, 14, 28, 49, 56, 98, 196, 392
690 : 1, 2, 3, 5, 6, 10, 15, 23, 30, 46, 69, 115, 138, 230, 345, 690
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 401,840,720,392,690, is 1.
Now, the common factors can be found like this.
401:401
840:2x 2x 2x 3x 5x 7
720:2x 2x 2x 2x 3x 3x 5
392:2x 2x 2x 7x 7
690:2x 3x 5x 23
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 2x 2x 2x 3x 3x 5x 5x 7 = 201600
Therefore, the value for common factors is 201600.
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 = 65598107904000/(1x201600)
LCM = 65598107904000/201600
LCM = 325387440
Thus, we can understand that the LCM of 401,840,720,392,690 is 325387440.
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FAQs on LCM of 401, 840, 720, 392, 690
1. What is the LCM of 401, 840, 720, 392, 690?
Answer: LCM of 401, 840, 720, 392, 690 is 325387440.
2. How to calculate the LCM of 401, 840, 720, 392, 690?
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 401, 840, 720, 392, 690.
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}.