My first set of mathematics concentration thinking books (all 4 volumes)

This set of books selects four themes that children love to see: animals, dinosaurs, marine life, and transportation. Through the dual training mode of mathematics and popular science, it helps parents cultivate their children's mathematical thinking and concentration from an early age. The popular science classroom section in the book allows children to observe patterns while listening to parents read out knowledge related to the patterns, so that the game book can also have the function of a popular science book; the mathematical word problems are set to cover addition and subtraction within 50. And mixed operations can initially develop children's arithmetic skills; counting games can not only cultivate children's sensitivity to numbers, but also improve children's concentration.