These rigid transformations worksheets are ten 8th grade math Mini Mystery Detective cases on translations, rotations and reflections. In every case a forger has slid, flipped or turned a shape, and students use the matching letters to find the side lengths, angles, perimeter and parallel sides of the copy, which is exactly what the 8.G.A.1 standard asks them to verify. It is transformations practice for your geometry unit that works as math centers, bell ringers, homework or test prep, with answer keys included - just print and go.
Right after you introduce translations, reflections and rotations is when this pack fits best. Students discover for themselves that a copy keeps every length and every angle, because they have to match A to A' to find each answer. Each page puts two different moves side by side, so a flip and a turn are compared on the same sheet, and every CSI Mini Mystery Detective page is self-marking.
What's Inside
- Ten one-page forgery cases, each with two shapes and their copies and 20 questions, and an answer key for every case
- Translations, reflections and rotations of trapezoids and pentagons, drawn to scale
- Questions on matching sides, matching angles, the perimeter and which side stays parallel
- A transformations reference page showing a slide, a flip and a turn, and what stays the same
- A contents page, teacher instructions, a detective case log and a certificate of achievement
- 30 black and white pages, ready to print
The Cases
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The Forged Vault Key - a copied key tag and bow
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The Cloned Bank Card - a fake chip and hologram
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The Copied Police Badge - a traced badge and crest
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The Frozen Camera Feed - a pasted window and doorway
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The Cloned Door Pass - a fake pass and keypad
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The Stolen Drone Plans - a turned wing and tail fin
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The Planted Fingerprint - lifted prints on glass
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The Cracked Safe Code - copied dial and hinge plates
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The Swapped Archive Files - fake file tabs and clips
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The Silenced Alarm - a flipped sensor plate
When to Use This Resource
Use these cases once students have seen the three rigid transformations and are ready to prove what each one keeps the same. Every page asks for lengths, angles, the perimeter and a parallel side, so students practice all three parts of 8.G.A.1 on every sheet. The measurements are split between the original and the copy, so students work in both directions, from the shape to its image and back again, which builds the habit of matching corresponding parts before the congruence lessons. Every case stands on its own, so you can use one a day across two weeks or give different cases to different groups. It works well for math centers and stations, bell ringers, homework, small group work, sub days, test prep, early finishers and end of year 8th grade geometry review.
Grade Levels
Written for 8th grade (8.G.A.1, properties of rotations, reflections and translations). It also makes a quick review of rigid motions for a high school Geometry class.
Why Teachers Love Mystery Detectives
- Zero prep - print and hand out
- Self-checking: every correct answer crosses off a suspect, so students catch their own mistakes
- All three properties of rigid transformations in one pack
- A forgery theme that suits older students
- Twenty different shapes and copies to work through
- Prints clean in black and white
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