Question 878888
Volume = length * width * height
Let's use inches to dispense with those pesky fractions.  We'll convert back later.
124" * 70" * 16" = 138,880 cubic inches
1728 cubic inches = 1 cubic foot
138880/1728 = 80.37 cubic feet
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Square feet would be for a flat surface.  If you wanted to calculate the square footage of the cardboard, calculate the area of each side:
124" * 70" = 8680" - 2 sides = 17360"
70 * 16 = 1120 -- 2 sides = 2240"
16 * 124 = 1984 -- 2 sides = 3968"
Total square inches = 23568 square inches
144 square inches in a square foot
23568/144 = 163{{{2/3}}}square feet