Numbers Series Test

Presenting a number sequence and asking what the next number might be is one of the most common tests in intelligence assessment because it translates one’s ability to detect an unspecified rule from a set of data, a feature that is highly associated with learning1 and learning potential2.

Inductive reasoning can be useful in many problem-solving situations and is used commonly by practitioners of mathematics3.


For each question, you will be presented with a sequence of numbers. You must select the number that completes the sequence and should replace the question mark.

Example: 2 - 4 - 6 - 8 - ?

The sequence follows a structure of 2 + 2 + 2 + 2, thus, the number that completes the sequences is 10. All the numbers are multiples of 2. 


This test is designed as an entertaining and educational tool. The results do not constitute a psychological or psychiatric evaluation of any kind and may not offer an accurate portrait of the mental fitness of the test taker. We do not guarantee the accuracy of the results and these should not be used as an indicator of the capacities of the individual for a specific purpose.
Responses may be recorded and used for research purposes or to be otherwise distributed. All responses are recorded anonymously.


1 Angluin D., Smith C.H. (1983). Inductive inference: Theory and methods. Comput. Surveys, 15 (1983), pp. 237-269.

2 Csapó, B. (1997). The Development of Inductive Reasoning: Crosssectional Assessments in an Educational Context. International journal of behavioral development. 20 (4), 609–626.

3 Pólya, G. (1954). Induction and Analogy in Mathematics. Princeton University Press. p. 120.