I count in memory 2 - Addition and subtraction within 20 PUS

MACHINE TRANSLATION (not authorised yet)

The booklet is to be used exclusively with the PUS Control Kit purchased separately.

The booklet is a set of tasks concerning four basic arithmetic activities, which, with their accessible and playful form, serve the purpose of learning the basics of accounting technique, consolidating the notion of number and improving the skills of symbolic recording of activities.