You need to know the least common denominator (LCD) of 6 and 84 if you want to add or subtract two fractions with 6 and 84 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 6 and 84 is 84.
Here is a math problem example where you need to know the LCD of 6 and 84 to solve:
3/6 + 2/84 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
84/6 = 14
84/84 = 1
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 14 = 42
2 x 1 = 2
Step 3) Put it all together to solve the problem:
42/84 + 2/84 = 44/84
= 3/6 + 2/84 = 44/84
It's that easy! Once again, the lowest common denominator (LCD) of 6 and 84 is as follows:
84
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