Room 13 Math Mystery | Grade 5 Adding & Subtracting Decimals | No-Prep Sub Plans
ROOM 13 MATH MYSTERY — GRADE 5 DECIMALS
Turn decimal practice into an engaging classroom mystery!
In Room 13, students become detectives investigating a mysterious missing room in an old school. Across four connected case files, they solve mathematical clues, examine historical plans, identify a hidden cabinet, and uncover the secret of Room 13.
Designed for Grade 5, this complete lesson focuses on adding and subtracting decimals to hundredths through meaningful, story-driven problems.
WHAT’S INCLUDED
6-page student mystery pack with four connected case files
4-page substitute teacher guide with clear instructions and worked solutions
1-page optional calculation worksheet
Answer keys and practical tips for helping students who get stuck
A separate final mystery reveal
WHY TEACHERS WILL LOVE IT
Low-prep, print-and-go activity
Designed to support substitute teachers, including non-math specialists
Step-by-step teaching guidance and calculations
Engaging detective storyline that encourages reasoning and curiosity
Suitable for regular classroom teachers, independent work, or small groups
LESSON DETAILS
Grade: 5
Subject: Mathematics
Skill: Adding and subtracting decimals to hundredths
Estimated duration: 40–45 minutes
Format: Printable PDF, US Letter (8.5 × 11 inches)
Curriculum: US Common Core-aligned decimal practice
Students follow the clues. Teachers have the answers.
Make math practice an adventure with Room 13 Math Mystery from Mirror City Resources.


