Clip 1/8: Standard 8: Look for & Express Regularity in Repeated Reasoning Using Addition
Overview
As they work to solve a problem, mathematically proficient students maintain oversight of the process, while attending to the details. They continually evaluate the reasonableness of their intermediate results.
In Katie Arrillaga’s 2nd grade Spanish bilingual classroom, she engages her students in a number talk, discussing whether or not their approaches to solving a two-digit addition problem (59 + 37) are reasonable. In this clip, her student Cesar begins with sharing one strategy for solving and addressing the challenge of how to use the 16 that results from adding 9 and 7. He begins, catches himself in the “intermediate results” stage, and changes his approach to use the “Australian Method” that the class had used elsewhere (and which is explained more fully in Arrillaga’s debrief.)