LCM of 300, 400, 780, 690
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 300, 400, 780, 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 300, 400, 780, 690. So, keep reading to learn more.
Given numbers are 300,400,780,690
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 300,400,780,690 is 358800.
Find LCM of 300,400,780,690 with Prime Factorization
| 2 | 300, 400, 780, 690 |
| 2 | 150, 200, 390, 345 |
| 3 | 75, 100, 195, 345 |
| 5 | 25, 100, 65, 115 |
| 5 | 5, 20, 13, 23 |
| 1, 4, 13, 23 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 3 x 5 x 5 x 1 x 4 x 13 x 23 = 358800
Therefore, the lowest common multiple of 300,400,780,690 is 358800.
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.
300 x 400 x 780 x 690 = 64584000000
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.
300 : 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 25, 30, 50, 60, 75, 100, 150, 300
400 : 1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400
780 : 1, 2, 3, 4, 5, 6, 10, 12, 13, 15, 20, 26, 30, 39, 52, 60, 65, 78, 130, 156, 195, 260, 390, 780
690 : 1, 2, 3, 5, 6, 10, 15, 23, 30, 46, 69, 115, 138, 230, 345, 690
10 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 300,400,780,690, is 10.
Now, the common factors can be found like this.
300:2x 2x 3x 5x 5
400:2x 2x 2x 2x 5x 5
780:2x 2x 3x 5x 13
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 3x 3x 5x 5x 5 = 18000
Therefore, the value for common factors is 18000.
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 = 64584000000/(10x18000)
LCM = 64584000000/180000
LCM = 358800
Thus, we can understand that the LCM of 300,400,780,690 is 358800.
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FAQs on LCM of 300, 400, 780, 690
1. What is the LCM of 300, 400, 780, 690?
Answer: LCM of 300, 400, 780, 690 is 358800.
2. How to calculate the LCM of 300, 400, 780, 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 300, 400, 780, 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}.