Clip 2/8: Standard 8: Look for & Express Regularity in Repeated Reasoning Using Multiplication & Division Part 1A
Overview
Mathematically proficient students notice if calculations are repeated, and look both for general methods and for shortcuts.
In this clip, Buljan works with her 3rd-grade students on a number talk, using a mental math approach to multiplying a two-digit number and a one-digit number. She encourages her students to identify regularity among the various approaches identified, and guides them toward identifying the commutative property.