@feline
I'm reading the OP as wanting to put the applique block in the CENTER of the Sawtooth.
@misoop
The sawtooth is a 4x4 grid, so if you want to use your blocks in the center, then the borders will be 5"(finished) each. The completed block will be 20"(finished).
Cutting instructions:
Corner squares - CUT 5.5"
Flying Geese - CUT rectangles 10.5" and the squares 5.5"
(use this method for construction
http://www.quilterscache.com/S/SawtoothBlock.html)
I prefer the Flying Geese method but you can also opt to make 8 HST's that come out 5.5" unfinished. Cut the squares 6.25", put 2 fabrics right sides together, sew once, diagonally, cut either side, blah, blah, blah, and then trim them down to 5.5" ;)