In this Editable Whodunnit activity, students will add and subtract rational numbers. Specifically, they will add and subtract negative fractions. All have mixed numbers or improper fractions and require simplifying. 12 problems! I used with kids who were showing mastery.This is an EDITABLE WHODUNNIT (using Microsoft Word). All you do is fill in the spots on the chart with your own staff names, movie characters, etc. The spots with who the suspect, victim, and weapon actually are are filled in s