The Power of Number and Proportion · Number Sense and Operations

Proportional Systems

Applying ratios, rates, and percentages to solve multi step financial and scientific problems.

Key Questions

  1. 1When does a constant rate of change become a predictable model for the future?
  2. 2How can proportional reasoning help us estimate populations that are too large to count?
  3. 3Why do small percentage changes result in large differences over long periods of time?

Ontario Curriculum Expectations

ON: Number - Grade 9ON: Algebra - Grade 9
Grade: Grade 9
Subject: Mathematics
Unit: The Power of Number and Proportion
Period: Number Sense and Operations

Suggested Methodologies

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