LCM of 640, 188, 378, 658, 420
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 640, 188, 378, 658, 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 640, 188, 378, 658, 420. So, keep reading to learn more.
Given numbers are 640,188,378,658,420
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 640,188,378,658,420 is 5685120.
Find LCM of 640,188,378,658,420 with Prime Factorization
| 2 | 640, 188, 378, 658, 420 |
| 2 | 320, 94, 189, 329, 210 |
| 3 | 160, 47, 189, 329, 105 |
| 5 | 160, 47, 63, 329, 35 |
| 7 | 32, 47, 63, 329, 7 |
| 47 | 32, 47, 9, 47, 1 |
| 32, 1, 9, 1, 1 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 3 x 5 x 7 x 47 x 32 x 1 x 9 x 1 x 1 = 5685120
Therefore, the lowest common multiple of 640,188,378,658,420 is 5685120.
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.
640 x 188 x 378 x 658 x 420 = 12569118105600
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.
640 : 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640
188 : 1, 2, 4, 47, 94, 188
378 : 1, 2, 3, 6, 7, 9, 14, 18, 21, 27, 42, 54, 63, 126, 189, 378
658 : 1, 2, 7, 14, 47, 94, 329, 658
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 640,188,378,658,420, is 2.
Now, the common factors can be found like this.
640:2x 2x 2x 2x 2x 2x 2x 5
188:2x 2x 47
378:2x 3x 3x 3x 7
658:2x 7x 47
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 2x 2x 2x 2x 3x 5x 7x 7x 47 = 1105440
Therefore, the value for common factors is 1105440.
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 = 12569118105600/(2x1105440)
LCM = 12569118105600/2210880
LCM = 5685120
Thus, we can understand that the LCM of 640,188,378,658,420 is 5685120.
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FAQs on LCM of 640, 188, 378, 658, 420
1. What is the LCM of 640, 188, 378, 658, 420?
Answer: LCM of 640, 188, 378, 658, 420 is 5685120.
2. How to calculate the LCM of 640, 188, 378, 658, 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 640, 188, 378, 658, 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}.