You need to know the least common denominator (LCD) of 85 and 87 if you want to add or subtract two fractions with 85 and 87 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 85 and 87 is 7395.
Here is a math problem example where you need to know the LCD of 85 and 87 to solve:
3/85 + 2/87 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
7395/85 = 87
7395/87 = 85
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 87 = 261
2 x 85 = 170
Step 3) Put it all together to solve the problem:
261/7395 + 170/7395 = 431/7395
= 3/85 + 2/87 = 431/7395
It's that easy! Once again, the lowest common denominator (LCD) of 85 and 87 is as follows:
7395
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