Students put all their addition and subtraction skills together to solve equations.

Match fun story problems with the correct addition or subtraction expression.

Under the common core, there are many ways to do subtraction—none of which involve borrowing and carrying.

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 ...