LCM of 641, 706, 840, 980
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 641, 706, 840, 980 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 641, 706, 840, 980. So, keep reading to learn more.
Given numbers are 641,706,840,980
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 641,706,840,980 is 1330485240.
Find LCM of 641,706,840,980 with Prime Factorization
| 2 | 641, 706, 840, 980 |
| 2 | 641, 353, 420, 490 |
| 5 | 641, 353, 210, 245 |
| 7 | 641, 353, 42, 49 |
| 641, 353, 6, 7 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 5 x 7 x 641 x 353 x 6 x 7 = 1330485240
Therefore, the lowest common multiple of 641,706,840,980 is 1330485240.
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.
641 x 706 x 840 x 980 = 372535867200
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.
641 : 1, 641
706 : 1, 2, 353, 706
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
980 : 1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 140, 196, 245, 490, 980
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 641,706,840,980, is 1.
Now, the common factors can be found like this.
641:641
706:2x 353
840:2x 2x 2x 3x 5x 7
980:2x 2x 5x 7x 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 5x 7 = 280
Therefore, the value for common factors is 280.
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 = 372535867200/(1x280)
LCM = 372535867200/280
LCM = 1330485240
Thus, we can understand that the LCM of 641,706,840,980 is 1330485240.
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FAQs on LCM of 641, 706, 840, 980
1. What is the LCM of 641, 706, 840, 980?
Answer: LCM of 641, 706, 840, 980 is 1330485240.
2. How to calculate the LCM of 641, 706, 840, 980?
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 641, 706, 840, 980.
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}.