How to Prepare for the Zetamac Arithmetic Test

A Zetamac score in the high 40s to 60s in two minutes is the range candidates report as competitive, and division is the operation most candidates neglect.

Zetamac is a free two-minute arithmetic drill that fires randomized addition, subtraction, multiplication and division problems at you from adjustable number ranges, and preparing for it means building speed on the operation you are worst at, not the one you already enjoy. Trading desks use it as a quick screen or ask candidates to run a round before a phone call, because a single two-minute session compresses working memory, number sense and composure under a clock into one comparable figure that takes almost no time to produce. The goal of preparation is always the same: raise your slowest operation until it stops being the one that decides your score.

In its default configuration, Zetamac mixes addition and subtraction of numbers roughly between 2 and 100 with multiplication and division built from a narrower factor range, commonly single digits up to 12 against two-digit numbers. Every problem sits on screen until you type a correct answer, so a wrong keystroke costs you the remaining time on that problem rather than ending the round. The final score is simply the count of correct answers inside 120 seconds, which means a fast wrong guess is worse than a slightly slower correct one.

Because the four operations are interleaved randomly, the score is really an average across four different skills, and a candidate who is excellent at multiplication but slow at division does not get to specialize. The clock keeps running through problem types you have not practiced, so a gap in one operation shows up as several seconds lost per problem across the whole two minutes, not as a single missed question the way it would on the interview questions bank.

Candidates who have been through processes at the top prop trading firms describe a range in the high 40s to 60s correct answers in two minutes as competitive, reported rather than published as an official cutoff by any firm. A score of 50 means roughly one correct answer every 2.4 seconds on average across the full round, accounting for the half second or so the interface takes to register each keystroke and load the next problem. That pace only holds if none of the four operations is dragging behind the other three.

A useful way to read your own score is to split it by operation rather than look at the total. Log ten rounds and note, roughly, how many of the missed seconds came from division versus the other three operations combined. Most candidates find one operation is responsible for a disproportionate share of lost time, and that operation is the one to isolate before running more mixed rounds.