CSI Math Mystery Bundle. Bring excitement to your classroom with this CSI Math Mystery Bundle! Designed for 3rd grade, 4th grade, and 5th grade students, these detective-style math activities transform ordinary worksheets into fun problem-solving cases. Students become detectives, solving puzzles and eliminating suspects until the final culprit is revealed. What is a CSI Math Mystery? A CSI Math Mystery is a detective-themed activity where students solve math problems and puzzles to uncover c