You need to know the least common denominator (LCD) of 8 and 28 if you want to add or subtract two fractions with 8 and 28 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 8 and 28 is 56.
Here is a math problem example where you need to know the LCD of 8 and 28 to solve:
3/8 + 2/28 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
56/8 = 7
56/28 = 2
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 7 = 21
2 x 2 = 4
Step 3) Put it all together to solve the problem:
21/56 + 4/56 = 25/56
= 3/8 + 2/28 = 25/56
It's that easy! Once again, the lowest common denominator (LCD) of 8 and 28 is as follows:
56
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