You need to know the least common denominator (LCD) of 5 and 39 if you want to add or subtract two fractions with 5 and 39 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 5 and 39 is 195.
Here is a math problem example where you need to know the LCD of 5 and 39 to solve:
3/5 + 2/39 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
195/5 = 39
195/39 = 5
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 39 = 117
2 x 5 = 10
Step 3) Put it all together to solve the problem:
117/195 + 10/195 = 127/195
= 3/5 + 2/39 = 127/195
It's that easy! Once again, the lowest common denominator (LCD) of 5 and 39 is as follows:
195
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