This works if the two numbers are close together. Empty number lines can help you work out the difference between the two numbers.

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

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 ...