# Clip 7/16: Problem 3 - Part A

## Overview

We carefully chose the problem 26 x 4 for this number talk (mental math) in order to apply the bar model to student thinking.

I think a key element to this lesson is a deep understanding of division. For this particular class at this time, I might try inserting a lesson before the division bar model problem, that asks students a multiplication bar model problem. Once we tried out both, students might clarify for themselves similarities and differences between the two types of stories and the two opposite operations.

## Teacher Commentary

Students first respond with the common strategy of using a traditional U.S. algorithm and making traditional errors.