A series of tasks encourage students to reflect on the reasonableness of their number sense and use benchmarks to refine their estimations.

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Mathematics Teacher: Learning and Teaching PK-12
  • National Council of Teachers of Mathematics (NCTM). 2000. Principles and Standards for School Mathematics. Reston, VA: NCTM.

  • Willis, Judy. 2010. Learning to Love Math: Teaching Strategies That Change Student Attitudes and Get Results. Alexandria, VA: Association for Supervision and Curriculum Development.

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