You need to know the least common denominator (LCD) of 3 and 6 if you want to add or subtract two fractions with 3 and 6 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 3 and 6 is 6.
Here is a math problem example where you need to know the LCD of 3 and 6 to solve:
3/3 + 2/6 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
6/3 = 2
6/6 = 1
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 2 = 6
2 x 1 = 2
Step 3) Put it all together to solve the problem:
6/6 + 2/6 = 8/6
= 3/3 + 2/6 = 8/6
It's that easy! Once again, the lowest common denominator (LCD) of 3 and 6 is as follows:
6
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