You need to know the least common denominator (LCD) of 68 and 8 if you want to add or subtract two fractions with 68 and 8 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 68 and 8 is 136.
Here is a math problem example where you need to know the LCD of 68 and 8 to solve:
3/68 + 2/8 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
136/68 = 2
136/8 = 17
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 2 = 6
2 x 17 = 34
Step 3) Put it all together to solve the problem:
6/136 + 34/136 = 40/136
= 3/68 + 2/8 = 40/136
It's that easy! Once again, the lowest common denominator (LCD) of 68 and 8 is as follows:
136
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