Reflection: Developing a Conceptual Understanding Estimation as a Strategy for Checking Work - Section 2: You are the Teacher


My students love to be the teacher and correct the work of some "other child" (me). I am hoping that students will be able to use place value as a way to construct a viable argument about why my work may or may not be correct (MP3). By asking students to correct the work of the imaginary child, they are forced to think about what the child has done, and if the answer is different from what they have found it to be, they must reason why it is different and how to fix it.

Students develop a better understanding of a mathematical process when they attempt to explain their thinking and to reason mathematically. This process of correcting the work of others encourages that deeper understanding of how a problem works.

  The Rewards of Being the Teacher
  Developing a Conceptual Understanding: The Rewards of Being the Teacher
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Estimation as a Strategy for Checking Work

Unit 18: Strategies That Work
Lesson 3 of 16

Objective: SWBAT use ballpark estimates to check the work of an imaginary student

Big Idea: Estimation can tell us if we are close in our answers to math problems. If we take the time to use it, we can see if our answer is in the right ballpark.

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Math, Number Sense and Operations, Operations , addition, subtraction, estimation, review
  40 minutes
screen shot 2014 06 01 at 10 44 31 pm
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