Number sequence test
16 series of numbers and letters. Work out the rule and pick what comes next.
- questions
- 16
- minutes
- 15
- no sign-up
- Free
Tips for series
Look at the gaps
Write the difference between each pair of numbers. The gaps often make their own simple pattern.
Think of two series
When numbers jump up and down, two separate series may be taking turns.
Know the classics
Squares, cubes, primes and the sum of the two previous numbers come up often.
What the scores mean
IQ scores are set so the average is 100 and two thirds of people land between 85 and 115.
| IQ | Range | Share of people |
|---|---|---|
| 130+ | Very high | 2% |
| 120–129 | High | 7% |
| 110–119 | Above average | 17% |
| 90–109 | Average | 49% |
| 80–89 | Below average | 16% |
| 70–79 | Low | 6% |
| ≤ 69 | Very low | 2% |
Shares follow the normal curve with a standard deviation of 15, the convention most modern tests use.
More tests
- Free IQ testThe full test: patterns, sequences and spatial puzzles.
- Quick IQ testA 10-minute estimate when you are short on time.
- Pattern testFigure matrices: find the rule, fill the gap.
- Spatial reasoning testTurn shapes in your head and spot the mirror image.
- IQ percentile calculatorTurn an IQ into a percentile and see how rare it is.
Questions
Do I need to be good at maths?
Only basic arithmetic. The hard part is spotting the rule, not doing the sums.
Can I use a calculator or paper?
Paper is fine and helps. A calculator rarely helps, since the numbers are small.