You need to know the least common denominator (LCD) of 28 and 3 if you want to add or subtract two fractions with 28 and 3 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 28 and 3 is 84.
Here is a math problem example where you need to know the LCD of 28 and 3 to solve:
3/28 + 2/3 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
84/28 = 3
84/3 = 28
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 3 = 9
2 x 28 = 56
Step 3) Put it all together to solve the problem:
9/84 + 56/84 = 65/84
= 3/28 + 2/3 = 65/84
It's that easy! Once again, the lowest common denominator (LCD) of 28 and 3 is as follows:
84
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