How do I tell the calculator 2 and 3/4, as in 2 a whole number, and 3/4 of a number.

There is a fraction calculator buit in.  It is in a drop down box on the top right of the main calculator.

If you don't understand or you would like more ways to do it look here.

http://web2.0calc.com/questions/how-do-i-type-in-fractions

Just highlight the address, right click, and open.

Just enter it like this........ (2 + 3/4)

You can also put it as 11/4