Be sure the team labels the shapes. Individual students need to be accountable to the team for contributing to the picture. Cashier adds up amounts on calculator. The cashier gives any change if necessary. Cashier checks to make sure current amount of money is given.
Students change roles after each purchase.
Rotate roles as paper changes hands during the progression of task. Assign math activity which is multi-stepped. Assign time within which activity is to be completed. The first person does part 1, person 2 does the second part using the answer the first person got, etc. Develop working relationship with a partner.