LCM of 638, 840, 620, 145
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 638, 840, 620, 145 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, 840, 620, 145. So, keep reading to learn more.
Given numbers are 638,840,620,145
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 638,840,620,145 is 8306760.
Find LCM of 638,840,620,145 with Prime Factorization
| 2 | 638, 840, 620, 145 |
| 2 | 319, 420, 310, 145 |
| 5 | 319, 210, 155, 145 |
| 29 | 319, 42, 31, 29 |
| 11, 42, 31, 1 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 5 x 29 x 11 x 42 x 31 x 1 = 8306760
Therefore, the lowest common multiple of 638,840,620,145 is 8306760.
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 840 x 620 x 145 = 48179208000
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
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
620 : 1, 2, 4, 5, 10, 20, 31, 62, 124, 155, 310, 620
145 : 1, 5, 29, 145
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 638,840,620,145, is 1.
Now, the common factors can be found like this.
638:2x 11x 29
840:2x 2x 2x 3x 5x 7
620:2x 2x 5x 31
145:5x 29
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 5x 5x 29 = 5800
Therefore, the value for common factors is 5800.
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 = 48179208000/(1x5800)
LCM = 48179208000/5800
LCM = 8306760
Thus, we can understand that the LCM of 638,840,620,145 is 8306760.
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FAQs on LCM of 638, 840, 620, 145
1. What is the LCM of 638, 840, 620, 145?
Answer: LCM of 638, 840, 620, 145 is 8306760.
2. How to calculate the LCM of 638, 840, 620, 145?
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, 840, 620, 145.
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}.