Halloween order of operations worksheets for 5th grade, set in a haunted hotel: one CSI Mystery Detective math case with fifteen suspect rooms and five clues built on parentheses, brackets and braces, with no exponents. It's October math your class can do with no prep. Use it as a Halloween math activity for math centers, a sub day, early finishers or the review week before PEMDAS moves on to exponents. Color and black and white pages are both included, and every clue has an answer key.
The week before Halloween is a good time for this case. Students work the five clues in order and cross rooms off the chart as they go, and the ghost's room only shows up when all the working is right. That does the checking for you. It's an order of operations activity that fills a full lesson, or a few days if you spread it out.
The Case: The Haunted Hotel
At midnight on Halloween every light in the Grand Hotel flickers, the lobby clock stops and a page goes missing from the guest register. The hotel ghost has settled into one of fifteen rooms for the night.
What's Inside
- Clue 1, the ghost's footprints: a hall of equation tiles where only the true ones can be stepped on, and the staircase at the end names the door color.
- Clue 2, the seance: thirteen instructions in words, and students pick the expression that says the same thing. The letters spell the ghost's message.
- Clue 3, the smudged ledger: ten lines with one operation sign rubbed out of each, to be worked out and written back in.
- Clue 4, the guest register: a crossnumber whose clues are expressions. The shaded digits tell you the floor.
- Clue 5, the hotel plan: solve the room you're in and leave by the door that shows your answer, from the lobby to the attic.
- Detective story, suspect chart, teacher notes, and full answer keys for every page
What Is a CSI Mystery Detective Case?
It's a printable investigation. Your class reads the story, gets a chart of fifteen suspects and works through five clue pages. Each clue is a different kind of math task, and each one rules some suspects out. When the arithmetic is right all the way through, one suspect is left.
When to Use This Resource
Teach it as a whole class lesson in the week of Halloween, or hand it to a small group that has finished the unit early. It also works as homework over a few nights, one clue at a time. Later in the year it's spiral review for test prep, and for 6th grade it's a first week warm up before exponents join the order of operations.
Grade Levels
Written for 5th grade, where numerical expressions with grouping symbols are taught (5.OA.A.1 and 5.OA.A.2). It also suits 6th graders who need the order of operations steady before exponents, and 4th graders ready for multi-step calculations. There are no exponents and no negative numbers in the pack.
Why Teachers Love CSI Mystery Detective Cases
- No prep. Print the pages and hand them out.
- The wrong answers on the pages are the mistakes students actually make, like working left to right or ignoring the parentheses, and you can see which step went wrong.
- Students check their own work, because a wrong answer leaves them with the wrong room.
- Five different puzzle types, not five pages of the same thing.
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