Reflection: Developing a Conceptual Understanding Think About Subtracting Nothing - Section 3: Practice the Concept


The students often think that this lesson is a silly review of an easy concept.  However, I think it is important for the students to understand that this really is a way for them to think about a strategy using concrete objects before we move to the abstract idea of mental strategies.  I'm preparing them by creating "mental models" for their later thinking. It is important for the students to understand that even though it seems easy, sometimes the easy concepts lay the foundation for more difficult skills.

  Thinking About Subtracting Nothing Reflection
  Developing a Conceptual Understanding: Thinking About Subtracting Nothing Reflection
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Think About Subtracting Nothing

Unit 3: The Action of Subtraction
Lesson 1 of 6

Objective: Students will be able to subtract 0, 1 and 2 from a number and apply this as 0 less than, 1 less than, and 2 less than within 20.

Big Idea: The big idea of this lesson is thinking about subtraction facts with 0, 1, and 2 as amounts less than a number.

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