Free teaching resource

Mini-Mystery – Which Key Opens the Door?

Teach Starter Publishing
PDF | 2 pages | Grades: 3 - 5

Use knowledge of 2-D shapes and right angles to solve the mystery in this fun, logic-based activity.

Can we trust those triangles?! 

In this engaging math activity, students review their knowledge of 2D shapes and right angles to find the correct key. 

Read the statements made by the characters and use logic and reasoning to eliminate ‘red herring’ characters who are trying to trick you! By combining the statements made by the characters with the Cold Hard Facts at the bottom of the page, students then decide which key opens the door.

piece of paper with a kids logic puzzle worksheet is laid out on a desk beside it to the left is a key

Right Angles and 2D Shapes Worksheet: Scaffolding and Extension Tips 

This teaching resource can be an engaging math warm-up exercise, a fast finisher task, or even a fun indoor recess activity. 

Students must use their geometry knowledge of 2D shapes and right angles to help solve the mystery.

In addition to individual student work time, use this 2D shapes worksheet as a:

Not only does this mini-mystery activity help your students with their memory and logical thinking, but it also provides learners with an opportunity to read between the lines.

In addition to solving the worksheet, students can also color it.  

A Variety of Ways to Prepare This Resource

Because this resource includes an answer sheet, we recommend you print one copy of the entire file. Then, make photocopies of the blank worksheet for students to complete.  

You can also turn this teaching resource into a sustainable activity! Print a few copies on cardstock and slip them into dry-erase sleeves. Students can record their answers with a dry-erase marker, then erase and reuse. 

Additionally, project the worksheet onto a screen and work through it as a class.

Before You Download

Use the dropdown icon on the Download button to choose between the PDF or Google Slides version of this resource. An answer key is also included with this download.

Get more handy worksheets here!

Don’t Stop There

We’ve got more 2-D Shapes Teaching Resources to cut down on lesson planning time:  

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Let's Sort It! - 2-D Shapes and 3-D Figures Sorting Activity

A sorting game to use in the classroom when identifying 2-D and 3-D shapes.

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Tangram Treats - Task Cards and Templates (Full Color Version)

A set of 36 tangram task cards separated into three levels, along with two tangram cut-out templates.

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