The vast majority of online IQ tests, certified IQ tests, and international IQ tests will feature questions and puzzles relating to number series. Due to the non-linguistic nature of number series and universal nature of mathematics, number series questions could potentially be part of an international IQ test or culture fair IQ test. However, they commonly aren’t featured in such IQ tests, simply because they often require a question format which features written instructions, which obviously ties them to a specific language.

**What is the Number Series Question Type? **

Number series question types consist of a series of numbers, to which the IQ test sitter must add the last in the sequence. The series of numbers will always be built according to a mathematical system, and will never be provided in random order – in such a case, a correct answer would be literally impossible to find!

In order to complete the number series correctly, the IQ test sitter must be able to see and identify the system or pattern which runs consistently throughout the sequence. This can be very difficult, even for seasoned mathematicians, yet it is something which can be practised and it’s a skill which can be improved upon.

In the vast majority of certified IQ tests, the number sequence question type will come with multiple choice options for the answers, making it a little easier to work out. For example:

3 – 0 – 6 – 0 – 12 – 0 – …

- 0
- 15
- 24
- 18

In this number sequence, the correct answer would be 24. That’s because the pattern of this sequence involves the first number being followed by a zero, then followed by double the previous number. As such, 12 x 2 is 24.

**The Number Sequence System**

Should you wish to write your own number series, either for an IQ test, or for practise purposes, you first have to come up with a numerical pattern or system which is unambiguous and which is consistently true. It can be a little tricky to come up with wrong answers which aren’t too easy to spot – after all, they have to be incorrect, but also somewhat believable in order to make the puzzle challenging for the intellect.

For example, in the number series given above, all of the answers are multiples of three, which is the first number in the series. There is, of course, only one correct answer, but the very fact that the wrong answers do correspond with a related pattern means the sitter will have to think about the answer they are selecting.