This task is from Tools for NC Teachers. Students solve an open-ended task that involves addition and subtraction of three-digit numbers. Part 3 aligns to 4.NBT.6. This is remixable.

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Filling the Auditorium

On a field trip, three different schools send their fourth graders across town to the high school auditorium for a math competition.  Each school sends between 120 and 170 students each. There are 417 students total. 

Part 1:

How many students could have come from each school?  Show your thinking.

 Part 2:

Find another possible solution to this task.  Show your thinking.

 Part 3:

If the number of students from each school was the same, how many students came from each school?  Explain how you found your solution.