Multiplication & Division Facts CSI Mystery Worksheets

Inside the case file

Multiplication and division facts from the 2 and 5 times tables run this CSI Mystery Detective case, built as 2nd grade and 3rd grade CSI math worksheets for August, when times table practice should not feel like a timed test. The school is empty, a smell drifts down the corridor, and the Mad Scientist has been in. The only way to undo it is to brew the antidote, and every ingredient depends on a correct fact. Print in color or black and white and hand it out. Students color the right arrow forward, check worked facts for errors, and decode division answers into ingredients, ruling out a suspect each time. Answer keys cover the full mystery.

The Case: The Mad Scientist

Your students arrive at school expecting the usual noise and find none of it. The office is empty. The corridors are empty. Every classroom is empty, and there is a smell coming from somewhere that no school should ever produce. The Mad Scientist has been in, and the only way to undo what has been done is to brew the antidote - which means getting every single ingredient right.

What's Inside

• 2 and 5 times table multiplication used to color the correct arrow forward
• Checking worked facts for errors and tallying which are correct
• Division facts decoded through a key to name the next ingredient
• Multi-step problems where the last answers unlock a code chart
• A matching page where the line drawn passes through the letter that matters
• Full color and black-and-white versions of every page
• Answer keys for the whole case

What Is a CSI Mystery Detective Case?

The rule of a CSI Mystery Detective case is that only correct math eliminates anybody. The class is given a crime, a line-up and a page of math worksheets, and works its way down to one name. It is a math escape room minus the locks, the app and the prep. That single rule is what makes detective activities self-marking: a wrong answer leaves too many suspects standing, and the students notice before you do. Run it as a full math activity, in math centers, or hand it to a substitute.

When to Use This Resource

• Times table practice that is not another timed test
• Introducing or consolidating the 2 and 5 times tables
• Math centers, early finishers and independent work
• Emergency sub plans that run themselves
• Back-to-school weeks and end of year review

Grade Levels

Built for 3rd grade and 4th grade, and it suits 2nd grade students who are meeting the 2 and 5 times tables for the first time. Third graders usually run it independently; second graders work in pairs and use it to build confidence before moving on to the harder tables.

Why Teachers Love CSI Mystery Detective Cases

• Zero prep - print and hand out
• Self-checking by design, because a wrong fact breaks the deduction
• Fact practice students ask to do again
• Works as a whole lesson, a center, or a filler for an awkward afternoon

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