Difficulties in dealing with measurements arise for children especially when they do not have mental access to reference sizes. This complicates their orientation in everyday life, which is heavily influenced by the aspect of measurement. The two practice books for grades 1/2 and 3/4 introduce measurements step by step: they draw on children's experiences from speaking and play situations, compare representatives directly and indirectly, and lead through measuring with standardized sizes up to converting units of measurement. The practice book for measurements in grades 1/2 includes: - Lengths up to the use of units cm and m - Times up to quarter hours, time spans with full and half hours - Monetary values up to EUR and ct in mixed amounts - A cardboard insert with strips as predefined units for comparative measuring.