You need to know the least common denominator (LCD) of 8 and 91 if you want to add or subtract two fractions with 8 and 91 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 8 and 91 is 728.
Here is a math problem example where you need to know the LCD of 8 and 91 to solve:
3/8 + 2/91 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
728/8 = 91
728/91 = 8
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 91 = 273
2 x 8 = 16
Step 3) Put it all together to solve the problem:
273/728 + 16/728 = 289/728
= 3/8 + 2/91 = 289/728
It's that easy! Once again, the lowest common denominator (LCD) of 8 and 91 is as follows:
728
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