The $200K Guesstimate

Fermi Math for Tech, Consulting, Startup & Finance Interviews

von Adrian Keller

112 Seiten, Taschenbuch

Kurzbeschreibung des Verlags

Big interview questions are rarely about finding one perfect number. They are about how you think when the data is incomplete.

The $200K Guesstimate teaches a practical framework for tackling Fermi and estimation questions across tech, consulting, startup, and finance interviews. Instead of memorizing famous answers, you learn a repeatable process:

DECOMPOSE → ANCHOR → SANITY-CHECK

Across 100 fully worked problems, you will practice how to break unfamiliar questions into manageable parts, choose defensible assumptions, keep units and orders of magnitude under control, stress-test uncertain inputs, and communicate your reasoning clearly under pressure.

Inside you will find:

- 100 worked estimation and interview problems- Tech, consulting, startup/VC, quant, finance, and classic Fermi examples- Step-by-step decomposition and sanity-check methods- Mental-math and calibration techniques- Sensitivity analysis and uncertainty handling- Sample spoken answers and common traps- A self-scoring rubric- 2-week and 30-day practice plans>This is an interview-preparation book about structured reasoning-not a collection of numbers to memorize. The goal is to make your thinking visible, adaptable, and defensible when the answer is uncertain.

• Reihe: Independently published
• ISBN: 9798175474467
• Sprache: Englisch
• Erscheinungsdatum: 19.09.2026
• Größe: 229 x 152 mm
• Verlag: Independently published