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