You need to know the least common denominator (LCD) of 64 and 85 if you want to add or subtract two fractions with 64 and 85 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 64 and 85 is 5440.
Here is a math problem example where you need to know the LCD of 64 and 85 to solve:
3/64 + 2/85 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
5440/64 = 85
5440/85 = 64
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 85 = 255
2 x 64 = 128
Step 3) Put it all together to solve the problem:
255/5440 + 128/5440 = 383/5440
= 3/64 + 2/85 = 383/5440
It's that easy! Once again, the lowest common denominator (LCD) of 64 and 85 is as follows:
5440
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