You need to know the least common denominator (LCD) of 9 and 99 if you want to add or subtract two fractions with 9 and 99 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 9 and 99 is 99.
Here is a math problem example where you need to know the LCD of 9 and 99 to solve:
3/9 + 2/99 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
99/9 = 11
99/99 = 1
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 11 = 33
2 x 1 = 2
Step 3) Put it all together to solve the problem:
33/99 + 2/99 = 35/99
= 3/9 + 2/99 = 35/99
It's that easy! Once again, the lowest common denominator (LCD) of 9 and 99 is as follows:
99
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