You need to know the least common denominator (LCD) of 7 and 99 if you want to add or subtract two fractions with 7 and 99 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 7 and 99 is 693.
Here is a math problem example where you need to know the LCD of 7 and 99 to solve:
3/7 + 2/99 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
693/7 = 99
693/99 = 7
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 99 = 297
2 x 7 = 14
Step 3) Put it all together to solve the problem:
297/693 + 14/693 = 311/693
= 3/7 + 2/99 = 311/693
It's that easy! Once again, the lowest common denominator (LCD) of 7 and 99 is as follows:
693
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