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.
- A Backyard Summer Fixture
- A City of Glass
- A City's Specialist Trade
- A City's Tea Scene
- A Citywide Chore
- A Connected Planet
- A Crowded Chain
- A Darker Shade
- A Day on the Tape
- A Difficult Business Year
- A Disposable Dining Habit
- A Famous Facade
- A Fast-Food Classic
- A Fresh Coat
- A Full Summer Canopy
- A Gateway's Daily Rhythm
- A Giant's First Day
- A Growing Café Business
- A Kitchen-Counter Puzzle
- A Lifetime Habit
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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.