You need to know the least common denominator (LCD) of 4 and 86 if you want to add or subtract two fractions with 4 and 86 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 4 and 86 is 172.
Here is a math problem example where you need to know the LCD of 4 and 86 to solve:
3/4 + 2/86 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
172/4 = 43
172/86 = 2
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 43 = 129
2 x 2 = 4
Step 3) Put it all together to solve the problem:
129/172 + 4/172 = 133/172
= 3/4 + 2/86 = 133/172
It's that easy! Once again, the lowest common denominator (LCD) of 4 and 86 is as follows:
172
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