These scale drawings worksheets are for 7th grade and 8th grade middle school math, with ten CSI Mini Mystery Detective math cases built around the floor plans of real buildings. Students use the scale to find the actual length, area and perimeter of rooms on floor plans and grid paper, including composite figures and harder scales like 2 in = 5 ft. It's 7.G.A.1 scale drawing practice for math centers, homework or test prep, the pages are no prep, and every case has an answer key.
Most scale drawings units finish with students drawing a floor plan of their own, and these cases are a good way to build up to it. Students read a real plan, pick out the right walls and turn plan inches into feet before they ever pick up a ruler. Each answer crosses a suspect off the list, so students check their own work as they go, and the case is solved when one name is left.
What's Inside
- 10 one-page cases with 20 questions on each, 200 problems in all
- An answer key for every case
- Nine drawn plans: floor plans with the measurements along the edges, and grid paper plans where students count squares
- One page of written scale drawing problems
- Inches and feet on most pages, centimeters and meters on three
- A reference page on reading a floor plan, finding real lengths, grid paper, perimeter, area and harder scales
- Teacher pages with the contents and instructions, a case log for students, and a certificate
- 30 pages. Everything prints in black and white
The Cases
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The Stolen Blueprints - an office plan, walls and perimeters
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The Shrinking Mansion - real wall lengths in a mansion
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The Forged Gallery - a museum on grid paper
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The Vanishing Field - a school plan in meters
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The Double-Booked Hotel - room areas from a hotel plan
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The Hidden Room - areas in an old bank
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The Missing Manuscript - L-shaped library rooms
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The Cramped Kitchen - two plans, two harder scales
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The Castle Forgery - written scale drawing problems
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The Architect's Last Plan - a hospital plan, mixed review
When to Use This Resource
Cases 1 and 2 start with the length of each wall and of the whole building on a measured floor plan. Cases 3 and 4 move to grid paper, where students count squares, then use the scale to find lengths and perimeters. Area comes in with Cases 5 and 6, and Case 7 adds L-shaped rooms, so students find the area of composite figures. Case 8 uses scales like 2 in = 5 ft, Case 9 is a page of written problems, and Case 10 brings everything together. You can give a single case to a small group, put a few in your sub plans, or keep the last ones for end of year review.
Grade Levels
Written for 7th grade (7.G.A.1). 8th grade classes can use it as review before similar figures and dilations.
Why Teachers Love Mystery Detectives
Every Mystery Detective pack works the same way. Once your class has solved one case, they know what to do with the next one, in this pack or any other. Each case also stands on its own, which means you can choose the one that fits what you're teaching that day. Naming the villain gives every page a clear end point, and the answer key lets you check a page quickly.
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