This task comes from Tools for NC Teachers. Students explore a task in which the concepts of factors and multiples are embedded. This is remixable.

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Eighty 4^th grade students at Andrews Elementary School are going on a field trip.  Their teachers need to put between 3 and 25 students in each group to visit the shark tank.   If four groups of eight students ride Bus #1, how many students will ride Bus #2?

 How many different ways can the teacher group the students on Bus #2 so that each group has the same number of students?  Find all possible solutions and explain your reasoning using pictures, numbers, or words.