FLU

Mental maths and numerical fluency

Arithmetic fast enough to quote from: multiplication, fractions, percentages and estimation under a clock.

Shared from Trading and market making
  1. 1

    Speed and technique

    The handful of methods that survive time pressure, and the tables worth committing to memory.

  2. 2

    Estimation and bounding

    Fermi decomposition, order-of-magnitude checks, and turning an estimate into an interval you would trade.