Number sense is defined as an intuitive understanding of numbers and their magnitude and relationships. You can test your own number sense and approximate number system (ANS) aptitude using a free online test called Panamath. The program is also available as a downloadable application so that researchers may use it for studies and educators may use it to assess students.
The test is simple. You are briefly shown a group of blue and yellow dots, and you must decide whether there were more blue dots or more yellow dots. Sound easy? Give it a try.