It depends on how long the ruler is, but most rulers are 12 inches and 12 inches=1 foot...so the answer would be 4 rulers for 4 feet...thats a lot of fours :)
I am presuming you are using 12inch rulers so as there are 12inches in a foot you will need 4 rulers
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43.0556 square feet.
4 ft by 4 ft = 4*4 = 16 square feet.
you need four pices of wood with the following lengths for a project:3 1/8 feet, 5 1/2 feet 2 3/4 feet,and 4 feet how many feet of wood do you need?
12 feet
20 Sqft.