In this Number Talk, Elysha Passeggi engages her 4th grade students in a discussion about whether or not the sum of two two-digit numbers can be 238. Students share their responses, defend their thinking, and formulate declarative statements about why the problem is definitively false.

Taught by: Elysha Passeggi, San Carlos Charter Learning Center, San Carlos School District, San Carlos, California

Mathematical Strand:

- Operations & Algebraic Thinking