NOTE: This activity is sold in parts. The activities increase in their challenge level so I would suggest starting with the first installment of each activity.
I developed this activity to extend Grid Grouping (also available on TPT) into percent applications. This set of activities continue to emphasize efficient grouping strategies while allowing students to "discover" how percents relate to sets of values.
I have used this as an introductory activity to percent applications for years and this activity has given me great diagnostic information about my students.
Included is a reflection sheet that I provide for my students to explain to me, in words, which process they used to complete the task.