Created By : Jatin Gogia
Reviewed By : Rajasekhar Valipishetty
Last Updated : Apr 06, 2023
Make use of LCD Calculator to determine the Least Common Denominator of 21, 87, 28 i.e. 2436 smallest integer divisible by all numbers.
LCD of 21, 87, 28 is 2436
LCD(21, 87, 28) = 2436
Ex: 10, 15, 20 (or) 24, 48, 96,45 (or) 78902, 89765, 12345
LCD of numbers 21, 87, 28 is 2436
LCD(21, 87, 28) = 2436
Arrange the Inputs 21,87,28 in a horizontal line separated by commas and divide them with a prime number. Note the quotients in the next row and divide with quotients with prime numbers again. Continue the process until you have all co primes in the last.
3 | 21, 87, 28 |
7 | 7, 29, 28 |
1, 29, 4 |
As all the numbers left in the last row are co primes you need not do the common division process further.
To obtain the Least Common Denominator, multiply the prime numbers with which you have divided the given numbers and the co primes in the last row i.e. 3 x 7 x 1 x 29 x 4 = 2436
Therefore, LCD of 21,87,28 is 2436
Step1:
Let's calculate the LCD of first two numbers
The formula of LCD is LCD(a,b) = ( a x b) / GCF(a,b)
GCF(21, 87) = 3
LCD(21, 87) = ( 21 x 87 ) / 3
LCD(21, 87) = 1827 / 3
LCD(21, 87) = 609
Step2:
Here we consider the LCD from the above i.e. 609 as first number and the next as 28
The formula of LCD is LCD(a,b) = ( a x b) / GCF(a,b)
GCF(609, 28) = 7
LCD(609, 28) = ( 609 x 28 ) / 7
LCD(609, 28) = 17052 / 7
LCD(609, 28) = 2436
LCD of 21,87,28 is 2436
Here are some samples of LCD of Numbers calculations.
1. What is the LCD of 21, 87, 28?
Answer: LCD of 21, 87, 28 is 2436.
2. How to find LCD of 21, 87, 28 on a calculator?
Answer: You can find LCD of 21, 87, 28 by simply giving the inputs in the input field and clicking on the Calculator button next to it to get the concerned Least Common Denominator.
3. How to Find the LCD of 21, 87, 28?
Least Common Denominator of 21, 87, 28.
Step 1: Divide all the numbers with common prime numbers having remainder zero.
Step 2: Then multiply all the prime factors with last row quotient of common division that is LCD(21, 87, 28) = 2436.