There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of two or more fractions. Even if you converted your numbers (x) to their fraction equivalents (x/1), the LCD will always be 1.
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The common denominator is 28.
7
The LCD of both numbers is 28
First find the Least Common Denominator between 8 and 24. Since 24 is divisible by 8, the LCD is 24. 7/8 = 21/24 7/24 = 7/24 7/8 + 7/24 = 21/24 + 7/24 = 28/24 = 7/6 = 1 1/6. Your answer is one and one sixth.
28 is the LCD