Additive Thinking and Mental Strategies · Operations and Algebra

The Relationship Between Operations

Exploring how addition and subtraction undo each other within fact families.

Key Questions

  1. 1How can knowing an addition fact help you solve a related subtraction problem?
  2. 2Why does the order of numbers matter in subtraction but not in addition?
  3. 3How can we use a part-part-whole model to represent different types of story problems?

Ontario Curriculum Expectations

ON: Number - Grade 2ON: Algebra - Grade 2
Grade: Grade 2
Subject: Mathematics
Unit: Additive Thinking and Mental Strategies
Period: Operations and Algebra

Suggested Methodologies

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