An article teaching adding and subtracting numbers with 1 or 2 digits.

Addition & subtraction strategies to solve two-digit equations using an open number line.

Decompose numbers to subtract. Engage in a Number Talk focused on subtraction strategies. Can you solve the problem without pencil and paper? Play a fun subtraction game called "Less than 10".

Researchers from 4 projects with a problem-solving approach to teaching and learning multidigit number concepts and operations describe (a) a common framework of conceptual structures children ...