Multiplicative comparison worksheets for 4th grade, with ten CSI Mini Mystery Detective math cases of comparison word problems. Students answer "times as many" and "times as much" questions for 4.OA.A.1 and 4.OA.A.2, and the dinosaur museum theme suits any time of year. They're ready for math centers, morning work or homework in your multiplication and division unit. There's no prep, and each case comes with an answer key.
The first five cases stick to times table facts. The last five use 2-digit by 1-digit numbers, and cases 8 to 10 add a few "how many more" questions, where students need to subtract after they multiply. Each correct answer crosses one name off the suspect list, and the one left over is the villain.
What's Inside
- 10 one-page cases with 15 word problems each, and an answer key for every case
- Three kinds of question on every page: find the bigger amount, find the smaller amount, and "how many times as many?"
- Times table facts in cases 1 to 5. Cases 6 to 10 use 2-digit by 1-digit numbers
- "How many more" questions in cases 8 to 10
- A contents page, teacher instructions and a reference page with worked examples
- A case log and a Dino Detective certificate
- 30 pages in black and white
The Cases
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The Stolen T. Rex Tooth - a giant tooth taken from its glass case
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The Cracked Dino Egg - the museum's dinosaur egg found cracked open
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The Missing Fossil Map - a dig site map taken from a desk
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The Bone Yard Break-In - dinosaur bones scattered overnight
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The Runaway Robot Raptor - a robot dinosaur switched on at midnight
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The Stolen Amber - amber with a bug inside taken from the gem room
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The Flooded Dig Site - a burst pipe fills the fossil pit
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The Swapped Skeleton - a real skeleton replaced with a plastic one
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The Gift Shop Grab - stuffed dinosaurs missing from the shop
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The Lights-Out Gala - a gold trophy gone during a museum party
When to Use This Resource
Hand out case 1 once your class has had a first lesson on "times as many." Cases 1 to 5 keep the numbers small, and cases 6 to 10 bring in bigger ones, which means you can work through the pack in order as the unit goes on. Cases 8 to 10 also mix in "how many more" questions, and they make good review before a test. You can use the cases with small groups, on sub days, for test prep or in homeschool, and 5th grade teachers can use them for back to school review.
Grade Levels
Made for 4th grade (4.OA.A.1 and 4.OA.A.2). It also works as multiplication review at the start of 5th grade.
Why Teachers Love Mystery Detectives
- Print and hand out. Nothing to prep
- Self-checking pages, which saves you grading time
- Multiplicative comparison word problems, starting with facts and moving to 2-digit numbers
- A dinosaur museum theme, from a stolen T. rex tooth to a lights-out gala
- Black and white pages that copy cleanly
Want more cases like these?
Follow Kiwiland Education to discover more CSI Mini Mystery Detective cases, no-prep math activities, and detective-themed printables for elementary classrooms.
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