It’s time to investigate! In this no-prep CSI Mystery Activity, students must use critical thinking, teamwork, and knowledge of Adding & Subtracting Rational Numbers (Integers, Decimals, Fractions & Mixed Numbers) to solve a fun and thrilling crime case.

Students will need to answer 20 questions about Rational Number Addition & Subtraction. There are 5 stations; each station includes 4 questions and 1 clue. Each clue helps rule out one innocent suspect. By the end of all 5 stations, students will eliminate 5 innocent suspects and figure out which one of 6 suspects is guilty.

This activity is perfect for: Math class, Sub plans, distance learning, morning work, team-building, test prep, early finishers, critical thinking practice, whodunnit games, crime scene investigations, escape room and CSI-themed activities.

🕵️ Important Note (Please Read Before Using) :

This CSI Mystery activity is fun and interactive, but it can also be a bit challenging at first - especially for students who have never played this type of mystery or escape-style review game before.

To ensure a smooth experience:

• Preview the game and storyline before class so you’re familiar with how students will progress through the stations and clues.
• Take a few minutes to explain the game structure to your students before starting - how they’ll move between the 5 stations, answer questions, collect clues, and eliminate suspects.
• Consider doing one station together as a class to model how it works before letting groups continue independently.

Once students understand the flow, they’ll quickly get into it and have an amazing time solving the mystery!

5 Clues are:

• Clue 1: DNA
• Clue 2: Fingerprint
• Clue 3: Shoe Print
• Clue 4: Car
• Clue 5: Door Key

What’s included in this resource:

• Teacher Instructions & Setup Guide
• Mission with Engaging Storyline
• Suspect List
• 20 Questions & 5 Clues (in two formats: full-page and 4-per-page)
• Color & Grayscale Versions
• Google Forms Digital Escape Room (no-prep, paperless option)
• Room Decorations, Detective Badges, & Certificates

Digital files include:

• Fully Digital & Self-Grading Google Forms: Includes all questions, clues, mission and suspect list for an all-online experience
• Locks-Only Google Forms: Ideal for use with printed materials in a hybrid setup
• Digital Recording Sheet: A paperless way for students to track their answers