Ability tests are a typical part of the selection process, or for development within the workplace. Number sequence tests are one of the most commonly used aptitude tests that come up during a job application. Number sequence tests, also called number series, are standardized psychometric assessment tests that provide the employing organization with information about a candidate’s general ability to logically reason with numbers. In this test, you are to find the missing number in a given sequence. This initial sequence has a defined pattern and you are to determine this pattern and thereby find the missing number.