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Check out Graham's Building Fact Fluency Toolkit for addition and subtraction.

standards: MCC5.MD.3, 4, 5

Download the Task

Act 1


  • How many unifix cubes will fit inside the cube? Estimate
  • Write an estimate you know is too high.  Write an estimate you know is too low.

Act 2

The dimensions of the cube and container

Act 3

The Reveal

Click the link here to find more of My 3-Act Lessons