<span><span>15 times 9.25 = 138.75 inches. That leaves
144-138.75 = 5.25 inches for spaces. Between the 15 boards are just 14 spaces, however. So divide 5.25 by 14 and get 3/8" for each space.</span> <span>Answer by </span>Cromlix(4300) (Show Source):You can put this solution on YOUR website! <span>Hi there, 14 boards each 9 1/4 inches wide. 14 x 9 1/4 = 138 3/4 inches 144 inches - 138 3/4 inches
= 5 1/4 inches Spaces between 14 boards = 13 spaces. 5 1/4 / 13 = 2/5 of an inch. Hope this helps. :-)</span></span>