Lesson objective: Solve word problems using addition strategies.

This lesson provides an opportunity for students to apply their knowledge and understanding of using a number line and related addition and subtraction facts to a real-life situation. Students are asked to figure out whether the money Kareem has saved is enough money to buy a baseball and a glove.

Key Concept students will use:

Skills students will use:

- Representing and solving an addition/subtraction word problem within 10 (Unit K-10; K.OA.A.2).
- Understanding that the meaning of addition and/or subtraction doesn’t change when different strategies are used (Unit K-10).

Students engage in Mathematical Practice 7 (Look for and make use of structure) as they solve a word problem using the relationship between additon and subtraction using number lines and/or a triangle diagram.

**Key vocabulary: **

- equation
- number line
- related facts