Children of preschool age differentiate between big and little, light and heavy, many and few, same and different, round and square, straight and crooked. Through use of games and play, the practice materials in this volume further the mathematical knowledge children need before entering school.The practical suggestions and examples included help persons in childcare and preschool teachers to convey to children 5-6 years of age how much fun and enjoyment the basics and laws of mathematics can provide. The motivating and scientifically evaluated exercises are complemented by exercises involving objects from daily life such as jelly jars, pearls, marbles, etc.