Number Sequences Practice

Free · no sign-up · unlimited new questions

In a number sequence you see a series of numbers and have to find the next one. There is always a rule behind it, and your job is to spot it. On IQ-Fun the sequences are generated by an algorithm, so you never get the same question twice, and after every answer you see a short explanation of the rule.

Practice number sequences now › Mensa simulation

How it works

Easy: constant steps (+3, −4), doubling, or steps that grow at a steady rate.
Medium: Fibonacci-style sequences (each number is the sum of the two before it), square numbers, two interleaved sequences, or alternating operations.
Hard: mixed operations, polynomials, prime numbers, powers and nested patterns.
You choose from four answers. Guessing is allowed — there are no penalty points.

Sample question

Which number comes next?

12,  13,  15,  18,  22,  ?

Show solution

27 — Differences grow by 1 each time: 1, 2, 3, 4. Next difference: 5, so 22 + 5 = 27.

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Tips

Write down the differences between neighboring numbers. If the differences form a sequence of their own, you have often found the rule.
Check whether every second number belongs together — if so, two sequences are interleaved.
If the numbers grow quickly, think of multiplication, squares or powers.

Relevance for IQ and Mensa tests

Number sequences are a classic part of intelligence tests. Similar questions appear in many IQ tests and aptitude tests.

Frequently asked questions

How many number sequences can I practice?

As many as you like. Every question is newly generated, so you can play as many rounds as you want — free and without signing up.

Do I get the solution explained?

Yes. After each answer you see the correct solution and the rule behind it, whether you were right or wrong.

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