Numicon. Games and tasks with details of the famous constructor

Numicon is a unique game made of flat plastic pieces of different colors with holes for teaching children mathematics, arithmetic, and geometry, developed using a special methodology in the United Kingdom. Numicon is now used in kindergartens and schools in many countries. This book comes with a set of thick paper pieces. How to play with Numicon? Each piece has one or more holes, through which children can put their fingers for counting.