You need to know the least common denominator (LCD) of 3 and 11 if you want to add or subtract two fractions with 3 and 11 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 3 and 11 is 33.
Here is a math problem example where you need to know the LCD of 3 and 11 to solve:
3/3 + 2/11 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
33/3 = 11
33/11 = 3
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 11 = 33
2 x 3 = 6
Step 3) Put it all together to solve the problem:
33/33 + 6/33 = 39/33
= 3/3 + 2/11 = 39/33
It's that easy! Once again, the lowest common denominator (LCD) of 3 and 11 is as follows:
33
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