Embroider each knitted triangle with a number from 1 through 20
Sew knitted triangles together, leaving off one panel.
Cut out 20 foam board triangles using 6.5 to 7 inches as the median (6.5if using polyester fiberfill on the outside, 7 inches is not)
Using tape to tape triangles together – five triangles should share one point. Fill project with polyester fiberfill (or scraps) as desired
Use hot glue to fill in seams between the triangles
Use hot glue to add polyester fiberfill to the outside of the foam D20 if desired.
Wrap knitted D20 around the foam D20 core.
Sew on last knitted triangle panel
Enjoy your giant knitted D20!