You need to know the least common denominator (LCD) of 71 and 9 if you want to add or subtract two fractions with 71 and 9 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 71 and 9 is 639.
Here is a math problem example where you need to know the LCD of 71 and 9 to solve:
3/71 + 2/9 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
639/71 = 9
639/9 = 71
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 9 = 27
2 x 71 = 142
Step 3) Put it all together to solve the problem:
27/639 + 142/639 = 169/639
= 3/71 + 2/9 = 169/639
It's that easy! Once again, the lowest common denominator (LCD) of 71 and 9 is as follows:
639
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