LCM of 420, 391, 448, 665
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 420, 391, 448, 665 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 420, 391, 448, 665. So, keep reading to learn more.
Given numbers are 420,391,448,665
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 420,391,448,665 is 49922880.
Find LCM of 420,391,448,665 with Prime Factorization
| 2 | 420, 391, 448, 665 |
| 2 | 210, 391, 224, 665 |
| 5 | 105, 391, 112, 665 |
| 7 | 21, 391, 112, 133 |
| 3, 391, 16, 19 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 5 x 7 x 3 x 391 x 16 x 19 = 49922880
Therefore, the lowest common multiple of 420,391,448,665 is 49922880.
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.
420 x 391 x 448 x 665 = 48924422400
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.
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
391 : 1, 17, 23, 391
448 : 1, 2, 4, 7, 8, 14, 16, 28, 32, 56, 64, 112, 224, 448
665 : 1, 5, 7, 19, 35, 95, 133, 665
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 420,391,448,665, is 1.
Now, the common factors can be found like this.
420:2x 2x 3x 5x 7
391:17x 23
448:2x 2x 2x 2x 2x 2x 7
665:5x 7x 19
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 5x 7x 7 = 980
Therefore, the value for common factors is 980.
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 = 48924422400/(1x980)
LCM = 48924422400/980
LCM = 49922880
Thus, we can understand that the LCM of 420,391,448,665 is 49922880.
LCM of two or more Numbers Calculation Examples
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FAQs on LCM of 420, 391, 448, 665
1. What is the LCM of 420, 391, 448, 665?
Answer: LCM of 420, 391, 448, 665 is 49922880.
2. How to calculate the LCM of 420, 391, 448, 665?
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 420, 391, 448, 665.
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}.