Ans before minus problem [Beginner Alert]

[superludvig]

Well, decided to buy the hp prime for school and now I've ended up in a problem. Every time I enter a negative number, especially irritating in statistics, "Ans" decides to pop up before the minus sign. Making go back a step to delete 3 letters every time I need to input a negative number. Is there an option to dissable the automatic "ans"?