After introducing and working with more complex addition and subtraction word problems in 2nd and 3rd grade (review), this is a great anchor chart for interactive math notebooks. This includes several examples of ways students think about addition and subtraction. NOT key words, but more like thinking patterns involved in each operation.

Includes: Number line arrows, strip diagram examples with missing part or missing whole, sum/difference, thinking patterns: Joining, Separating, Comparing, and an example of each type of question.