Read this article to figure out how to calculate the lowest common denominator of . Learn the two different methods that you can use to find the LCD: the prime factorization method and the LCD formula method. We will explain both these methods in detail so stick around until the very end to understand. Utilise our free LCD Calculator to avail the LCD of numbers easily.
Given numbers are 136,420,821
We can find the LCD of numbers 136,420,821 by the prime factorization method or by applying the LCD formula.
The LCD of 136,420,821 is 11723880.
2 | 136, 420, 821 |
2 | 68, 210, 821 |
34, 105, 821 |
As you can see, now we have to multiply the prime numbers on the left side with the co-primes at the bottom.
2 x 2 x 34 x 105 x 821 = 11723880
Thus, we have determined that the LCD of 136,420,821 is 11723880
The LCD formula is LCD(a,b) = ( a x b) / GCF(a,b)
Step1:
Find the GCF of 136 and 420. To find the GCF, list down the factors of 136 and 420 and select the highest factor that appears in both lists of factors.
136 : [1, 2, 4, 8, 17, 34, 68, 136]
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]
From this, we can see that the GCF of 136 and 420 is 4.
Now, put this into the LCD formula.
LCD(136, 420) = ( 136 x 420 ) / 4
LCD(136, 420) = 57120 / 4
LCD(136, 420) = 14280
Step2:
Find the GCF of 14280 and 821. To find the GCF, list down the factors of 14280 and 821 and select the highest factor that appears in both lists of factors.
14280 : [1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 17, 20, 21, 24, 28, 30, 34, 35, 40, 42, 51, 56, 60, 68, 70, 84, 85, 102, 105, 119, 120, 136, 140, 168, 170, 204, 210, 238, 255, 280, 340, 357, 408, 420, 476, 510, 595, 680, 714, 840, 952, 1020, 1190, 1428, 1785, 2040, 2380, 2856, 3570, 4760, 7140, 14280]
821 : [1, 821]
From this, we can see that the GCF of 14280 and 821 is 1.
Now, put this into the LCD formula.
LCD(14280, 821) = ( 14280 x 821 ) / 1
LCD(14280, 821) = 11723880 / 1
LCD(14280, 821) = 11723880
LCD of 136,420,821 is 11723880
Here are some samples of LCD of Numbers calculations.
1. What is the LCD of ?
Answer: LCD of is .
2. How to find LCD of using prime factorization ?
Answer: Just keep dividing by prime numbers until only co-primes are left over. At that point, simply multiply the co-primes with the prime numbers on the left. The answer will be , the LCD.
3. How to Find the LCD of using LCD formula ?
Answer: The LCD formula is LCD(a,b) = ( a x b) / GCF(a,b).
You must first calculate the LCD OF and . Then, find the LCD of that answer and and so on. The answer will be , which is the LCD of .