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University of Waterloo (Canada)

Centre for Education in Mathematics and Computing: Ratio and Rate [Pdf]

For Students 6th - 8th Standards
Learners explore the concepts of rate and ratio in a variety of problem-solving situations. Worksheets contain definitions and visual representations of concepts. Link to related ratio game. Other skills include measurement, data...
Activity
The Math League

The Math League: Ratio and Proportion

For Students 3rd - 8th Standards
This tutorial provides definitions and examples of ratios and proportions and features comparing ratios and converting rates.