Reflection: Adjustments to Practice Thinking Addition Facts to 18 to Subtract - Section 3: Practice the Concept


The most difficult thing I find about giving the students these tasks to practice is that they often need reminders about really taking the time to build the models before solving.  The goal is that these models, with repetition, will later become mental models that will help them solve problems mentally and recall facts fluently.  Many second graders are often more concerned about getting the problems solved.  I found that if I explain the purpose to the students beforehand, they become more committed to the practice, as opposed to just "do it because I said you have to."  It is important for students to have ownership over their work and their understanding.

  Addition Facts to 18 Reflection
  Adjustments to Practice: Addition Facts to 18 Reflection
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Thinking Addition Facts to 18 to Subtract

Unit 3: The Action of Subtraction
Lesson 4 of 6

Objective: The students will be able to find the "difference" in subtraction facts by determining the related addition fact, within 18.

Big Idea: Students apply their understanding of addition to solve related subtraction problems.

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