A number series question is asking you to complete a sequence. You have to look at the relationship of the numbers in the sequence to find what number comes at the end.

Consider this string of numbers:

2, 4, 8, 16, …

Without having to look at the suggested answers we can read the sequence and see that to find the next number we just have to double the number that came before.

Number series questions aren’t always this simple there might be more than one pattern occurring in the same sequence, for example, look at this sequence.

12, 37, 13, 36, 14, …

It looks confusing, the numbers don’t seem to have a specific relationship to the next BUT if we look at it like this…

12, 37, 13, 36, 14, …

One sequence is counting up from 12 and the other counting down from 37 in an alternating pattern. So now we can work out that the next number in the sequence is one less than 36.

These are both simple examples of number series questions, practice as much as you can before you sit a real test, this way you will start to recognize typical sequence patterns much faster.