Lesson objective: Apply subtraction strategies to solve real-world problems.

This lesson provides an opportunity for students to apply their knowledge and understanding of subtraction strategies to a real-life situation. Students are asked to find out how many puppies are left at the shelter after some are adopted, using addition strategies.

Key Concept students will use:

- The meaning of subtraction does not change when different strategies are used.

Skills students will use:

- count on strategy
- number partners strategy

Students engage in Mathematical Practice 1 (Make sense of problems and persevere in solving them) as they use the number bonds and take away strategies to solve a real-world problem. Students show their understanding of subtraction as taking apart and taking away.

**Key vocabulary: **

- number bond

**Special materials needed:**

- none