Math task blog that tackles the difference between mass and volume in two boxes of clay through a noticings/wondering exercise.

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Math task blog that tackles the difference between mass and volume in two boxes of clay through a noticings/wondering exercise.
Three act lessons for elementary classrooms, organized by standard.
Decimal decision tasks and student work and reasoning about why 2/.1 is 20, not .2
Tasks from the YouCubed team and Jo Boaler. Indexed by grade level, practice standard, and mathematical topic.