Your question leaves much to interpret. Do you have any patterns, or just want a very basic 14.5in strips joined together? If the latter, then you will need 7 x 14.5in strips for each block, times 9 blocks = 63 strips cut 14.5ins. You will probably only get to cut two from each jelly roll strip. You could also cut strips into three, join different colors end to end, then cut the 14.5in strips to make your block, would add a bit more character.