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Maths Forensics/FAST FORENSICS CASE 4 : THE DISTANCE BETWEEN LIES
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FAST FORENSICS CASE 4 : THE DISTANCE BETWEEN LIES

A handbag snatch. One suspect. A tight alibi. Jack Simmons says he was at a pub — but the timings don’t add up. Use speed and distance, probability, and phone mast triangulation to track his movements and test the truth. Think fast, analyse the data, and decide: guilty or innocent?
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What You’ll Learn

- Use speed, distance, and time to test an alibi

-Apply proportion and probability to judge witness reliability

-Use coordinates & triangulation to locate a suspect’s phone

Who is this For?

✔ Students aged 12–16 (GCSE / IGCSE level)

✔ Learners who enjoy problem-solving and realistic scenarios

✔ Revision or extension work

✖ Not a worksheet pack — this is an investigation

  • ⏱️ Takes around 60–90 minutes

  • 📄 PDF + video briefing + interactive quiz

  • ✅ Certificate of Completion

Why does this matter?

By the end of this case, students won’t just get the right answer — they’ll be able to justify it, explain their reasoning, and recognise which maths tool to use under pressure.

Enjoyed this case? Fast Forensics cases are designed to build skills used across our full Case File Series.

Contents

Knowledge Content

This section contains the learning materials required to know in order to solve this case

Speed Unit.pptx
Proportion.pptx

Solving the Case

This section contains the briefing document and the briefing video along with solving the case quiz

FAST FORENSICS BRIEFING AND WITNESSES.mp4
_FAST FORENSICS 4 BRIEFING DOCUMENT.pdf
streetrobberymap.pdf

End of case quiz

Solving the difference between lies quiz