The types of problems in this video should be used before teaching the use of proportions. Why do think that is? How will the types of problems presented in this video strengthen proportional reasoning in your students? How would you use these types of problems in your classroom? On your own, practice writing a few of the types of problems suggested in this video. For more information on proportional reasoning go to module 5 on proportional reasoning at tidewaterteam.wm.edu/MPDCDocs/index.php . The research for this video comes from the article, “Three Balloons for Two Dollars” by Cynthia W. Langrall and Jane Swafford, which can be found here: tidewaterteam.wm.edu/MPDCDocs/smpdfs/proportionareasoningmtms.pdf.