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

Links verified on 1/15/2010

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
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. Ratio, proportion and percentages [inverse proportion] - explanation, one example, and three practice problems
14. Ratio, proportion and percentages [direct proportion] - explanation, two examples, and two practice problems
15. Solving Problems Involving Direct Proportion - [close the subscription screen to get to the problems] some good practice problems are presented here, UK units used
16. Solving Proportion Problems - four examples with detailed explanation
17. Some Inverse Proportion Problems - all about how one change causes another [a 2 page MS Word document]