An average gram cracker is made up of 3 rectangular pieces.

The witch's head is made up of 5 sides all together.
Each side is 2/3 of a gram cracker (2 rectangular pieces).

The witch's hat is 1 whole gram cracker (for the base) and 2/3 of a gram cracker cut in a triangle (for the top).

The witch's nose is 1/3 of a gram cracker cut diagonally.

To cut the pieces, take a small thin edged knife, dip it in some water and with a gentle back-and-forth motion cut the gram cracker. The water helps soften the gram cracker for a clean cut and will help to avoid unnecessary cracking.