2nd grade and 3rd grade CSI math worksheets on 2D shapes for February, a CSI Mystery Detective geometry mystery that runs on sides, edges, quadrilaterals and measuring height in inches. It works as a winter math activity when the class needs fun math worksheets that still count as real geometry practice. Every page comes in color and black and white; only the final cut-and-rearrange page needs scissors. A shape has done something and the only witnesses are other shapes. Students decode the opening message, shade every shape with four sides to build the line-up, measure each one and count the squares in a composite figure until a single suspect is left.
The Case: The Geometry Investigation
A shape has done something and the only witnesses are other shapes, which makes the descriptions unusually precise and completely useless at the same time. Your students take it stage by stage: decode the first message, work out how many sides the culprit has, put the four-sided shapes in a line-up, measure them, and see which one is left when the measurements are in.
What's Inside
- A letter-and-number cipher that decodes the opening message
- Listing and drawing as many four-sided shapes as your students can name
- Shading every shape with four sides, also called edges, to build the suspect list
- Measuring the height of each shape in inches to narrow the line-up
- Counting how many squares appear in a composite figure
- A cut-and-rearrange page where the pieces have to make a square
- Full color and black-and-white versions of every page, and answer keys
What Is a CSI Mystery Detective Case?
A CSI Mystery Detective case is math worksheets with a verdict attached. The class is handed a crime and a line-up, and every correct answer removes one suspect until a single name remains. It behaves like a math escape room with the locks, the app and the prep taken out. And because only right answers eliminate anybody, detective activities check themselves as the class works. It fills a whole math activity, works in math centers, and holds up as a sub plan.
When to Use This Resource
- Introducing or consolidating 2D shapes and their properties
- Measuring practice with a reason behind it
- 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 2nd grade and 3rd grade. Second graders usually need the measuring page talked through once before they start; third graders run the whole investigation independently. It also suits 1st grade students who are ahead on shape names and ready for something longer.
Why Teachers Love CSI Mystery Detective Cases
- Almost no prep - print, and one page needs scissors
- Self-checking by design, because an early error shows up later
- Shape work students will actually finish
- Works as a whole lesson, a center, or a filler for an awkward afternoon
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