Links

Chapter 11: Ratio, Rate and Percent

Drawing Proportions
http://realcolorwheel.com/human.htm
This link goes to a site that describes average human proportions. This provides an excellent context for applying ratio concepts.

Fermi Problems
www.physics.umd.edu/perg/fermi/fermi.htm
http://schools.hpedsb.on.ca/smood/fermi.htm
These links take the user to collections of Fermi problems.

Gear Ratios
http://science.howstuffworks.com/gear-ratio.htm
This links to a demonstration showing how ratios apply to gears.

Math Forum
http://mathforum.org/library/drmath/sets/select/dm_ratio.html
This links to a variety of pages related to ratio concepts.

Percent Activities
www.nald.ca/FULLTEXT/numboost/percents/activ/1.htm
This links to a variety of activities that deal with percents on a conceptual level.

Percent Grids
http://illuminations.nctm.org/LessonDetail.aspx?id=L249
This links to a lesson plan that relates percent to hundredths grids in order to solve proportions.

Proportional Reasoning of Elementary Education Majors
http://eric.ed.gov:80/ERICWebPortal/custom/portlets/recordDetails/detailmini.jsp?
_nfpb=true&_&ERICExtSearch_SearchValue_0=ED364556&ERICExtSearch
_SearchType_0=eric_accno&accno=ED364556
This links to the report of a study where you can find out how pre-service teachers view proportional reasoning.

Ratio Activities and Games
www.bbc.co.uk/skillswise/numbers/wholenumbers/ratioandproportion/ratio
This links to information about ratios and a variety of ratio games.

Rate Video
www.youtube.com/watch?v=uspr0Tq3gIQ
This links to a YouTube video about rate.