zigzag, zig zag, area of a rectangle, thinking outside the box, increasing surface area with limited space, surface area, radiator, radiators, heating elements, storage, folding yardstick, paper fan, paper fans, accordion, accordions, concertina, concertinas, bellows, multiplication, division, decimals, inches, centimeters, answer sheet included Combine mathematics, science, and fun with this activity. Can You Walk Through a Hole in a Sheet of Paper? begins very much like a parlor trick but use