This book emphasises the need for children to explore many experiences in problem solving in order to apply and strengthen their mathematical abilities. It is composed of 29 problems from the "Problem Solvers" column in Teaching Children Mathematics, NCTM's journal for elementary school teachers. The situations offered are intended to engage students in interesting explorations in which they do challenging, interesting problem solving with significant mathematical content. The book also features solutions and children's work that were sent to the editors from children and teachers from around the country.