You need to know the least common denominator (LCD) of 78 and 11 if you want to add or subtract two fractions with 78 and 11 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 78 and 11 is 858.
Here is a math problem example where you need to know the LCD of 78 and 11 to solve:
3/78 + 2/11 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
858/78 = 11
858/11 = 78
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 11 = 33
2 x 78 = 156
Step 3) Put it all together to solve the problem:
33/858 + 156/858 = 189/858
= 3/78 + 2/11 = 189/858
It's that easy! Once again, the lowest common denominator (LCD) of 78 and 11 is as follows:
858
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