You need to know the least common denominator (LCD) of 12 and 4 if you want to add or subtract two fractions with 12 and 4 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 12 and 4 is 12.
Here is a math problem example where you need to know the LCD of 12 and 4 to solve:
3/12 + 2/4 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
12/12 = 1
12/4 = 3
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 1 = 3
2 x 3 = 6
Step 3) Put it all together to solve the problem:
3/12 + 6/12 = 9/12
= 3/12 + 2/4 = 9/12
It's that easy! Once again, the lowest common denominator (LCD) of 12 and 4 is as follows:
12
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