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 ...

Test out your knowledge of adding 3-digit and 1-digit numbers together with this quiz, then read on to complete the page.

The numbers are adding up quite nicely at Westview Elementary School. Students in Nikki Carney’s second-grade class are adding and subtracting three-digit numbers with ease.

Learn how to use column addition to add 3-digit and 2-digit numbers with this Year 4 Bitesize learning guide for KS2.