Unusual Mathematics. A Workbook of Logical Tasks for 4-Year-Olds

"Unusual Mathematics" is a series of workbooks for children aged four to eight. You are holding the first workbook in this series.
The main goal of the "Unusual Mathematics" series is not to teach preschoolers to count (they will learn that anyway), but to engage the child, inviting them on an exciting journey into the world of logic and mathematics.