Bicycles are advertised as having ten, fifteen, speeds, or even 21 speeds, but do these bikes really have that many? Come shift some gears and learn how this problem helps middle school children develop their proportional-reasoning skills by applying them to a familiar situation. The speaker will shared activity guides and students' work.

Presentation Format: 6-8 Session
Grade Band Audience: 9 to 12, 6 to 8