Multiplication & Division CSI Mystery Worksheets
Grades 4–6 · The Mad King's Spy
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Inside the case file
CSI Mystery Detective practice for multiplication and division fact fluency, on CSI math worksheets made for February when times tables need to be quick and right. The Mad King is burning through the villages and always knows exactly where to strike, because somebody inside is telling him. Your students have until he arrives to find the spy, and this multiplication and division mystery for 4th grade and 5th grade narrows the description with every correct fact until only one villager fits. It doubles as 4th grade math review, prints in color or black-and-white, and comes with answer keys. Students check facts for errors and color the correct route to the next clue.
The Case: The Mad King's Spy
The Mad King is coming. He has been burning his way through the villages one after another, and the reason he always knows exactly where to strike is that somebody inside is telling him. There is a spy in the village, and your students have until he arrives to work out who. Every fact they get right narrows the description - height, build, family crest - until only one person in the village fits it.
What's Inside
- Checking multiplication and division facts for errors and tallying the results
- Multi-digit addition with three-digit and four-digit numbers
- Times table practice used to color the correct route to the next clue
- Addition and subtraction along a path where the final total settles the answer
- A matching puzzle 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?
A CSI Mystery Detective case is a printable whodunit where the answers, not the clues, do the eliminating. Students work the page; each correct answer rules one suspect out; the last name standing is the arrest. Think math escape room with no locks, no batteries and nothing to prepare. Set against ordinary math worksheets it has a check built in - bad arithmetic leaves a description matching nobody - so mistakes surface on their own. Use it as a whole math activity, in math centers, or as detective activities for early finishers.
When to Use This Resource
- Fact fluency practice that is not another timed test
- Back-to-school weeks and end of year review
- Math centers, early finishers and independent work
- Emergency sub plans that run themselves
- Whole-class detective sessions, small groups or partner work
Grade Levels
Built for 4th grade and 5th grade. Fourth graders usually pair up for the four-digit addition; fifth graders can run the whole case on their own inside a lesson. It also gives 6th grade students whose times tables have gone rusty a way to rebuild them without it feeling like going backwards.
Why Teachers Love CSI Mystery Detective Cases
- Zero prep - print and hand out
- Self-checking by design, because a wrong answer 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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