In this Number Talk, Debbie Borda and Antoinette Villarin engage their 7th grade students in mentally calculating the savings received by a student who paid $54 for an item that was discounted 40%. The students in the class first think their way through the problem, then share their strategies with a partner, then share strategies and answers with the class as a whole.

Taught by: Debbie Borda and Antoinette Villarin, Jefferson Elementary School District, Daly City, California

Mathematical Strand:

- Number & Operations in Base Ten