You need to know the least common denominator (LCD) of 6 and 13 if you want to add or subtract two fractions with 6 and 13 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 6 and 13 is 78.
Here is a math problem example where you need to know the LCD of 6 and 13 to solve:
3/6 + 2/13 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
78/6 = 13
78/13 = 6
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 13 = 39
2 x 6 = 12
Step 3) Put it all together to solve the problem:
39/78 + 12/78 = 51/78
= 3/6 + 2/13 = 51/78
It's that easy! Once again, the lowest common denominator (LCD) of 6 and 13 is as follows:
78
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