You need to know the least common denominator (LCD) of 6 and 69 if you want to add or subtract two fractions with 6 and 69 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 6 and 69 is 138.
Here is a math problem example where you need to know the LCD of 6 and 69 to solve:
3/6 + 2/69 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
138/6 = 23
138/69 = 2
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 23 = 69
2 x 2 = 4
Step 3) Put it all together to solve the problem:
69/138 + 4/138 = 73/138
= 3/6 + 2/69 = 73/138
It's that easy! Once again, the lowest common denominator (LCD) of 6 and 69 is as follows:
138
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