I didn't have pre-cuts I cut 6" blocks in half and used them and it's nothing like stack and whack you just sew 2 triangles together short sides together then sew short side to 3 x 8 rectangle place the two triangles on top of triangle with rectangle I matched the points of triangle together I found it better you have about 1/4 more at bottom but just sew 1/4 in along the bottom of triangles and cut the rest off. I did it 2 ways and they both end up the same....Clear as day right. I watched the video about 3 times before I figured it out for my self that it doesn't match up as she said....It's 3 triangles and a rectangle and no stacking involved it's great....