LCM of 840, 987, 578, 890
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 840, 987, 578, 890 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 840, 987, 578, 890. So, keep reading to learn more.
Given numbers are 840,987,578,890
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 840,987,578,890 is 1015465080.
Find LCM of 840,987,578,890 with Prime Factorization
| 2 | 840, 987, 578, 890 |
| 3 | 420, 987, 289, 445 |
| 5 | 140, 329, 289, 445 |
| 7 | 28, 329, 289, 89 |
| 4, 47, 289, 89 |
Multiply the prime numbers at the bottom and the left side.
2 x 3 x 5 x 7 x 4 x 47 x 289 x 89 = 1015465080
Therefore, the lowest common multiple of 840,987,578,890 is 1015465080.
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.
840 x 987 x 578 x 890 = 426495333600
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.
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
987 : 1, 3, 7, 21, 47, 141, 329, 987
578 : 1, 2, 17, 34, 289, 578
890 : 1, 2, 5, 10, 89, 178, 445, 890
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 840,987,578,890, is 1.
Now, the common factors can be found like this.
840:2x 2x 2x 3x 5x 7
987:3x 7x 47
578:2x 17x 17
890:2x 5x 89
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 3x 5x 7 = 420
Therefore, the value for common factors is 420.
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 = 426495333600/(1x420)
LCM = 426495333600/420
LCM = 1015465080
Thus, we can understand that the LCM of 840,987,578,890 is 1015465080.
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FAQs on LCM of 840, 987, 578, 890
1. What is the LCM of 840, 987, 578, 890?
Answer: LCM of 840, 987, 578, 890 is 1015465080.
2. How to calculate the LCM of 840, 987, 578, 890?
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 840, 987, 578, 890.
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}.