Mental maths, market intuition, and defending your number.
Start a session with David →“Roughly what's 17% of 4,300? Now tell me how confident you are.”
Every session ends with a written report scored on these three axes, with the transcript attached so you can see what earned each mark.
Stating assumptions, showing the working, and arriving at a number the listener can follow and check.
Arithmetic accuracy under time pressure, soundness of the financial or probabilistic concepts, and sensible sanity-checking.
Committing to an estimate, stating uncertainty honestly, and revising cleanly when shown a flaw.