Lesson objective: Solve addition and subtraction word problems using tape diagrams and equations.

This lesson helps to build fluency with solving "Put Together/Take Apart" and "Add To/ Take From" word problems. Tape diagrams are used here to make a pictorial representation of the word problem This work develops students ability to understand word problems and create addition and/or subtraction equations to solve many types of word problems.

Students engage in Mathematical Practice 2 (reason abstractly and quantitatively) as they reason about word problems and create tape diagrams to show addition and subtraction situations. (Students engage in decontextualizing word problems.)

**Key vocabulary:**

- tape diagram
- unknown
- missing addend