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Lesson

4th Grade Math - Number Operations: Multiplication & Division

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.