LCM of 638, 978, 420
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 638, 978, 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 638, 978, 420. So, keep reading to learn more.
Given numbers are 638,978,420
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 638,978,420 is 21838740.
Find LCM of 638,978,420 with Prime Factorization
| 2 | 638, 978, 420 |
| 3 | 319, 489, 210 |
| 319, 163, 70 |
Multiply the prime numbers at the bottom and the left side.
2 x 3 x 319 x 163 x 70 = 21838740
Therefore, the lowest common multiple of 638,978,420 is 21838740.
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.
638 x 978 x 420 = 262064880
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.
638 : 1, 2, 11, 22, 29, 58, 319, 638
978 : 1, 2, 3, 6, 163, 326, 489, 978
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
2 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 638,978,420, is 2.
Now, the common factors can be found like this.
638:2x 11x 29
978:2x 3x 163
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 3 = 6
Therefore, the value for common factors is 6.
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 = 262064880/(2x6)
LCM = 262064880/12
LCM = 21838740
Thus, we can understand that the LCM of 638,978,420 is 21838740.
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FAQs on LCM of 638, 978, 420
1. What is the LCM of 638, 978, 420?
Answer: LCM of 638, 978, 420 is 21838740.
2. How to calculate the LCM of 638, 978, 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 638, 978, 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}.