You need to know the least common denominator (LCD) of 9 and 49 if you want to add or subtract two fractions with 9 and 49 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 9 and 49 is 441.
Here is a math problem example where you need to know the LCD of 9 and 49 to solve:
3/9 + 2/49 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
441/9 = 49
441/49 = 9
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 49 = 147
2 x 9 = 18
Step 3) Put it all together to solve the problem:
147/441 + 18/441 = 165/441
= 3/9 + 2/49 = 165/441
It's that easy! Once again, the lowest common denominator (LCD) of 9 and 49 is as follows:
441
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