Proportional Reasoning

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Proportional Reasoning

Big Ideas

Qualitative comparison: Descriptive comparison (Ex: The blue line is bigger than the black line)

Additive comparison: Basic Addition/subtraction to compare (Ex: The blue line is 5cm longer than the black line)

Multiplicative comparison: Multiplication used to compare (Ex: The blue line is twice as long than the black line)

Models

Subtopic

Strategies

Looking at/comparing size

Identifying more/less than

Identifying ratios

- Recognizing multiplicative comparisons between ratios. - Proportional relationships can be expressed using fractions, ratios, and percents. - Students begin to develop the ability to reason proportionally through informal activities.