I need help from you wonderful quilters, we are on vacation and I did bring my machine and projects with tools to work on. I have done all the blocks for a Lucky Stars quilt and I need to square them up to 15 1/2 by 15 1/2 inches and of course I did not bring a ruler big enough. I have a 9 1/2 square one and the 6 by 12 size. Can I do it with what I have thanks.