Ii has to do with the number of decimals you decided to keep.
If you only handle addition, multiplication and subtraction of whole (integer) numbers you will not suffer from the lack of decimals. But if you divide integer numbers more often than not you will have decimal numbers ex. 1/2=0.5, 1/3=0.333333333etc. If you forbid the calculator to show decimals the first one above will be 1, and the second will be 0.
My advice: ignore the zeros that come after the decimal mark. They will not hurt you if YOU NEVER DIVIDE.
Hope it helps.
If i type 10+10 it comes up with 10+10=20 and my setting is on Math G . So mabey try that ?
Usually answered in minutes!