In the third title in the photograph-based Help Me Learn series (following Help Me Learn Numbers 0–20 and Help Me Learn Addition), Marzollo uses puppets, figurines, and other playful items to ...

This study examined Korean second and third graders' understanding of multidigit addition and subtraction and particularly their ability to explain the trading required when a column sum of the ...

The present paper describes the success, the methods (mental, informal written, standard algorithm) and the strategies of informal written arithmetic to be observed when 300 elementary students worked ...