Analyze the 3 given denominators:
4 = 2*2
8 = 2*2*2
3 = 3
The three 2's that make up 8 are part of the LCD; the other part is the 3. Thus, your LCD is 24. Thus, 9/4= 54/24; 3/8 = 9/24; and 1/3 = 8/24.
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