Learn a method, drill it until it's automatic, then test under time.
Three rungs: a method that always works, the speed-ups on top, then the facts that make it instant.
No trick required. Work left-to-right with one running total — your reliable fallback for any numbers.
Faster — but only when the numbers fit the pattern. The real skill is spotting which one applies.
The real speed is recall, not method — especially division. Drill atomic facts until they're automatic.
A dedicated division-fact drill — the proven Zetamac/interview bottleneck — is coming next.
Measure under pressure — this is where your Math Rating moves.