To find how many 2 1/10-foot pieces Andrea can cut from the fabric, divide the total length of the fabric by the length of each piece: 8 2/5 / 2 1/10 = (42/5) / (21/10) = (42/5) * (10/21) = (42*10) / (5*21) = 420/105 = <<420/105=4>>4. Answer: \boxed{4}.
