A piece of wood is 81/10 feet long. How many 2-foot long pieces can be cut from the wood?

To find how many 2-foot pieces can be cut from the wood, divide the total length of the wood by the length of each piece: 81/10 / 2 feet = 81/10 * 1/2 = <<81/10*1/2=4.05>>4.05 pieces

Since you can't have a fraction of a piece, you can only cut 4 pieces from the wood. Answer: \boxed{4}.