The shortcuts used by quant traders daily
Reference guide — click any card to expand. No timer, no score.
Near-50 method, difference of squares, and algebraic shortcuts
×11, ×9, ×5, ×25, ×99, ×125 shortcuts
Decompose, cross-multiply, and near-round-number methods
Symmetry trick, key fraction-to-decimal conversions, EV shortcuts
Reference grid for squares 1–25, cubes, powers of 2 and 3
Divisibility rules for 2–11, GCD algorithm, fraction simplification
ln approximation, compound growth, Rule of 72, Rule of 115
DV01, Black-Scholes ATM approx, Put-Call Parity, Duration
8 trick sections covering 4 categories. Use the practice problems inside each card to drill specific techniques.
Only works in the Electron app
<webview> is an Electron-only tag. Run npm run electron:dev to use this.
<webview>
npm run electron:dev
25 min focus · 5 min break · long break every 4 sessions