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## Distinguish proportional relationships (y/x = k, or y = kx) from other relationships, including inverse proportionality (xy = k, or y = k/x). 0706.3.7

1. Algebra: Proportion Word Problems - explanation and examples [direct and inverse proportion explained]
2. Cat and Mouse: Direct and inverse proportion - The problem is actually a great opportunity to teach direct variation and inverse variation.
3. Direct Proportion - this explanation provides a clearly explained example
4. Direct Proportion - explanation and practice problems [Caution: metric units and UK monetary units used]
5. Direct Proportion - this 18 slide PowerPoint show has several examples
6. Direct Proportion - a 37 slide PowerPoint show with several "starter questions"
7. How to Determine Whether Two Variables Are Directly Proportional - explanation and several graphs
8. Inverse Proportion - this explanation provides a clearly explained example
9. Inverse Proportion - this 18 slide show has several examples [This expired link is available through the Wayback Machine Internet Archive. If the page doesn't load quickly click on Impatient? at the bottom right of the page.]
10. Inverse Proportion Problems - from Annenberg's Learning Math series
11. Math Word Problems [Variation or Inverse Proportion] - five question multiple choice quiz
12. Proportionality (mathematics) - this Wikipedia article explains direct and inverse proportion
13. Solving Problems Involving Direct Proportion - [close the subscription screen to get to the problems] some good practice problems are presented here, UK units used
14. Solving Proportion Problems - four examples with detailed explanation

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