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- The Concepts of Ratio and Rate as Comparisons.
- Ratios and Rates.
- Definitions of a Proportion.
- Solving a Proportion Involving Whole Numbers, Fractions and Decimals.
- Word Problems Involving Proportions.
- Percent as a Ratio.

- This content is a selection from: http://msenux2.redwoods.edu/PreAlgText/Prealgebra.pdf), which is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unsupported License.