You need to know the least common denominator (LCD) of 85 and 4 if you want to add or subtract two fractions with 85 and 4 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 85 and 4 is 340.
Here is a math problem example where you need to know the LCD of 85 and 4 to solve:
3/85 + 2/4 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
340/85 = 4
340/4 = 85
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 4 = 12
2 x 85 = 170
Step 3) Put it all together to solve the problem:
12/340 + 170/340 = 182/340
= 3/85 + 2/4 = 182/340
It's that easy! Once again, the lowest common denominator (LCD) of 85 and 4 is as follows:
340
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