LCM of 217, 661, 420, 978
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 217, 661, 420, 978 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 217, 661, 420, 978. So, keep reading to learn more.
Given numbers are 217,661,420,978
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 217,661,420,978 is 1402813860.
Find LCM of 217,661,420,978 with Prime Factorization
| 2 | 217, 661, 420, 978 |
| 3 | 217, 661, 210, 489 |
| 7 | 217, 661, 70, 163 |
| 31, 661, 10, 163 |
Multiply the prime numbers at the bottom and the left side.
2 x 3 x 7 x 31 x 661 x 10 x 163 = 1402813860
Therefore, the lowest common multiple of 217,661,420,978 is 1402813860.
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.
217 x 661 x 420 x 978 = 58918182120
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.
217 : 1, 7, 31, 217
661 : 1, 661
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
978 : 1, 2, 3, 6, 163, 326, 489, 978
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 217,661,420,978, is 1.
Now, the common factors can be found like this.
217:7x 31
661:661
420:2x 2x 3x 5x 7
978:2x 3x 163
From this, we can see that the common factors because they appear for more than two numbers. So, just multiply them all together.
2x 3x 7 = 42
Therefore, the value for common factors is 42.
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 = 58918182120/(1x42)
LCM = 58918182120/42
LCM = 1402813860
Thus, we can understand that the LCM of 217,661,420,978 is 1402813860.
LCM of two or more Numbers Calculation Examples
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FAQs on LCM of 217, 661, 420, 978
1. What is the LCM of 217, 661, 420, 978?
Answer: LCM of 217, 661, 420, 978 is 1402813860.
2. How to calculate the LCM of 217, 661, 420, 978?
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 217, 661, 420, 978.
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}.