Answer
1m=39.37 inches=3.28feet. 1m^2=10.76ft^2. The small intestine has 300m^2 of surface area:
300m^2/1m^2/10.76ft^2/=3,228ft^2
Work Step by Step
Just use the ratio between meters and feet to get to a ratio of square meters to square feet, then use the data in the text (p. 989) to get to the exact number of square feet.