Instead of labeling my 31 students' backpack hooks with their names or alphabetical order numbers, I printed these 4th grade review expressions, cut them apart, and posted each one on a hook.
On the first day of school, I give the students a blank sheet of paper to fold into squares. They solve an expression in each box until they find the one equal to their alphabetical order number. Quick students helped those who were having trouble.
In my class, no student hung up his/her backpack until all students had successfully found their hooks, but the game gets easier if each student hangs up his/her backpack as he/she finds his/her hook.
This served as a great informal assessment of what my incoming 5th and 6th graders remembered.