PreNumbers is a program that provides basic pre-numeric skills. Pre-numeric skills include: • Sorting things by specific characteristics • Dividing things into classes with specific characteristics • Recognize and distinguish shapes • Quantify and compare quantities • Detect seriality (recognize logical sequences and continue) • Recognize symmetries and patterns PreNumbers is available in 2 versions: * In PreNumbers not all exercises are available. The others can be unlocked via In-App Purchase. * In PreNumbers Pro all exercises are available. The program offers eight different exercises in three difficulty levels. A simple presentation (forest theme) supports concentration on the essentials. A childlike design was avoided, in order to make the app appealing also for older children and adolescents. To enable the use of the program with several people, PreNumbers offers a user manager. The individual settings and results can be saved and recalled quickly. Objectives: • Train pre-numeric skills • Playing Fields of operation: • Pre-school children • Children and adults with learning disabilities