Numerical Reasoning (NLDB)

What the NLDB measures

Cognitive aptitude tests are the single most accurate predictor of job performance across all industries, outperforming interviews, resumes, and personality tests combined. The NLDB focuses specifically on numerical and logical deduction. It does not measure advanced mathematical knowledge (like calculus); rather, it measures the brain's "processing speed" and ability to quickly identify rules within chaotic data sets (Fluid Intelligence - Gf).

The dimensions it assesses

• Numerical Sequences: Identifying the hidden algebraic or arithmetic rule governing a sequence of numbers.
• Logical Deduction (Syllogisms): Evaluating the absolute truth of a statement based only on provided premises, ignoring real-world knowledge (testing pure logic vs. cognitive bias).
• Data Interpretation: Extracting relevant information from a complex chart or graph and performing rapid mental math.

What to do with your result

1. The Fallacy of "I'm bad at math": Most errors on Q12, Q15, and Q17 are not due to poor arithmetic, but poor reading comprehension and "cognitive miserliness" (the brain jumping to the intuitive but wrong answer). Training in formal logic (identifying fallacies) improves these scores drastically.
2. Time Management: The primary constraint is time (36 seconds per question). Perfectionists fail this test. Users must learn the heuristic of "Triaging": if a sequence pattern is not immediately visible within 15 seconds, guess and skip.
3. Corporate Benchmarking: Do not require a score of 18 for a customer service role. Requiring excessive cognitive aptitude for mundane jobs leads to extreme turnover, as the employee will become bored and quit. Match the required score to the complexity of the role.

Common questions about the NLDB

What does the NLDB measure?

Measurement of fluid intelligence through numerical reasoning, pattern recognition, and logical deduction under strict time pressure.

Can the NLDB diagnose me?

No. Numerical Reasoning (NLDB) is a screening questionnaire, not a diagnostic tool. It can flag that something may need a closer look. It cannot tell you what is causing it. It describes tendencies rather than diagnosing anything, and no result here is a condition or something to fix.

How long does the NLDB take?

20 questions, which most people finish in 12 minutes (strictly timed). There is no time limit, and answering honestly matters more than answering quickly. The results page checks for patterns suggesting the questions were rushed.

Is this NLDB test really free?

Yes. No account, no email address, no payment. Psychometrics Today is funded by donations rather than advertising, which is also what allows us to publish instruments whose authors permit free but non-commercial use.

Are my answers stored or shared?

No. Your answers are scored inside your browser and never sent to us. There is no database of responses, because we never receive any. Closing the tab erases them, which is why results cannot be recovered afterwards.

How often should I retake the NLDB?

Traits and preferences move slowly, so retaking this every few months is more informative than retaking it often. Larger shifts usually follow a genuine change in circumstances.

Who created the NLDB, and is this the real version?

It was published by Psychometrics Today (original items). Numerical and deductive reasoning formats are generic and unprotected. The items here are the published ones rather than a paraphrase, and the scoring follows the original rules. Both are documented on this page so they can be checked.

How accurate is the NLDB?

Screening questionnaires are good at flagging that something merits attention and poor at establishing what it is. This one is sensitive to how you feel on the day you take it, and many instruments were validated on narrow populations whose cut-offs may not transfer cleanly to everyone. The references at the foot of this page are the primary sources.