You need to know the least common denominator (LCD) of 5 and 11 if you want to add or subtract two
fractions with 5 and 11 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 5 and 11 is 55.
Here is a math problem example where you need to know the LCD of 5 and 11 to solve:
3/5 + 2/11 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
55/5 = 11
55/11 = 5
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 11 = 33
2 x 5 = 10
Step 3) Put it all together to solve the problem:
33/55 + 10/55 = 43/55
= 3/5 + 2/11 = 43/55
It's that easy! Once again, the lowest common denominator (LCD) of 5 and 11 is as follows:
55
What is the Least Common Denominator of 5 and 12?
Go here for the next Least Common Denominator on our list that we calculated.

