Whats wrong with my calculator?

You may have changed the settings to show it to hoever many D.P. it is showing. If you can go into its settings you should be able to change it.

there is a setting that fixes the number of decimal places to a given number, so have a look at some of your mode functions. it may be on a scientific setting, or a fixed decimal setting. if all else fails, you should be able to just reset it - but you ought to learn how to get rid of it properly, especially if you're doing exams - just makes things easier

You must have changed the decimal place settings somehow. Its hard to tell you how to fix it unless you tell us the make and model of the calculator.

take the batery off and then put it back again or just reset the calculator

Probably the person using it! Try reading the instructions and set it up as you need it to display.

How to fix this varies from one calculator to another. Typically it involves pressing mode and then selecting something like calc or normal. For example, on most recent Casio calculators, press setup (which may be shift and mode), then 8:Norm and 1. I hope this helps.

get a new one!

your calculator needs to be changed to float. I can give you the steps depending on your calculator.

On your calculator try find the "mode" or "display" function. When you've found it, change it to "Normal" (it would be in "sci" or "fix" mode). That should fix it.