Fermi Questions
Order-of-magnitude estimation questions used in quant and trading interviews, break the unknown into parts, reason to a defensible answer, and track your progress as you solve.
- The Carbon Ledger
- The Citywide Coffee Run
- The Courtyard Centerpiece
- The Daily Rhythm
- The Digital Scrap Heap
- The Fast Rail Network
- The Fleet Behind Trade
- The Giant Venue Puzzle
- The Global Flock
- The Global Inbox
- The Inland Giants
- The Interview Room Puzzle
- The Kitchen-Counter Guess
- The Lighter Side of Traffic
- The Long Bet on Speed
- The Long-Haul Load
- The Market's Daily Pulse
- The Moving-Day Puzzle
- The National Classroom Network
- The National Road Network
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What are Fermi questions?
Fermi questions ask you to estimate a quantity you can’t look up, like “how many piano tuners are there in Chicago?”, by breaking it into parts you can reason about and combining sensible assumptions. Trading and quant interviewers love them because they reveal how you decompose a problem, handle uncertainty, and sanity-check a number under pressure.
On Tradermath, each question is graded by order of magnitude: get within a factor of ten and you’re on track. Work through the curated set, reveal hints when you’re stuck, and compare your estimate against a full worked solution to build the instinct that matters most in interviews.