Goal: Think as a mathematician! Find a calculation shortcut by chunking, changing the form, or connecting to math you know.
CthenC Planner Nines Plus or Minus
CthenC Meta Reflection Nines Plus or Minus
See this task in action in Dwaina Sookhoo’s 6th grade class
Task found in the CME Algebra textbook
Back to Contemplate then Calculate Tasks
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I like this task because there are so many calculation shortcuts and each allows you to dig into properties (e.g. assoc prop of addition, comm. prop of addition, distributive prop, additive identity, etc.)