Quoted from http://www.mccallsquilting.com/patterns/details.html?idx=8322:
Sawtooth Star
Sawtooth StarSize: 12″ Finished
Beginner Level
Cutting Instructions:
Green
1-A … 4 squares 3 1/2″ x 3 1/2″
1-B … 5 squares 2 1/2″ x 2 1/2″
1-C … 4 rectangles 3 1/2″ x 6 1/2″Red
2-A … 8 squares 3 1/2″ x 3 1/2″
2-B … 4 squares 2 1/2″ x 2 1/2″ASSEMBLY INSTRUCTIONS
Step 1. Flying Geese Unit
Draw a diagonal line on wrong side of Piece 2-A red squares. Layer Piece 2-A square and Piece 1-C green rectangle, right sides together. Sew on top of drawn line. Cut away excess fabric 1/4″ from seamline. Press seam allowance. Repeat for other end of rectangle (Diagram I). Make 4.
Diagram IStep 2. Nine-patch unit
Using Diagram II as a guide, sew red (Piece 2-B) and green (Piece 1-B) 2 1/2″ x 2 1/2″ squares together to make nine-patch unit.
Diagram IIStep 3. Block Assembly
Using Diagram III as a guide, sew green 3 1/2″ x 3 1/2″ squares (Piece 1-A) to Flying Geese units and nine-patch unit together to make Sawtooth Star Block.
Diagram III