For my Jitterbug quilt class, it was recommended that we buy the Creative Grids Multi-size 45° & 90° Triangle Ruler. It was either buy that or make half square triangles by cutting 2-7/8" squares. Yuck! So I bought it (and I love quilting rulers that make life easier anyways)!
Here is a picture of the ruler:
We have only used the 45 degree triangle side so far. Here's how you do it:
1. Cut (2) 2-1/2" strips of fabric the full width and place them on top of each other.
2. Press them together so they do not move as much while cutting.
3. Square off the end by lining the top edge with the little white dotted line above 45 and lining the bottom edge with the solid black line reading 2.
4. Cut first triangle.
5. Flip the ruler and cut next triangle. Continue until the whole strip is cut.
6. Chain piece them together sewing along the diagonal cut beginning in the corner where the point is missing.
7. Press the triangles closed with dark side facing up.
8. Open each one and press to form the squares.
9. Cut off dog ears and separate.