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 ...

The new theme is Addition and Subtraction, stories of humans becoming more and less and sometimes both with the help of technology.

Addition What is 4 + 5? We can put 4 things in one of the parts and 5 in the other part. By combining the two parts in the whole circle we can find the sum of 4 + 5.

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

Subtraction in Excel is like subtraction in real life — it's straightforward. You simply need to keep in mind that unlike other common arithmetic functions like addition, multiplication, and ...