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To find an LCD, you need to have at least two denominators.
45
12
288
1440
8
36
It is 8
It is: 12
The LCD of 3/4 and 4/5 is 20.
The LCD for 3/4 and 4/7 is 28.
The LCD for 4/7 and 3/5 is 35.
12 is the LCD for 3 and 4.
60
The LCD for 3/20 and 9/4 is 20