This is a set of 11 static addition problems using a digital version of the well-known Montessori math material called the Stamp Game. The stamp game can also be used to perform the other operations (subtraction, multiplication, and division). Using these boom cards, you can drag and drop the stamps (numbers) into the corresponding column on your virtual desk and then check your work.Static addition can be attempted after there is an understanding of how to form numbers using the stamp game mate