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When rounding, we always look at the number in the position directly to the right of the position we are interested in. In this case, the whole dollar is the number immediately to the left of the decimal, so we look at the number immediately to the right of the decimal. If this number is 5 or more, we add 1 to the number to the left of the decimal. If the number to the right of the decimal is 4 or less, we do not add 1 to the number to the left of the decimal.
In this case, the number is 4, so it rounds down to 0.
The selector you are asking about is the "decimal selector". The result displayed/printed, will be in a format according to the position that you have selected as follows:
f = floating (the result will be in the number of decimal places that were entered on the keyboard
4= fixed 4 decimal places (x.0000)
3= fixed 3 decimal places (x.000)
2= fixed 2 decimal places (x.00)
0= fixed 0 decimal places (x)
add 2= (add mode*,fixed 2 places) ($.00)
Note* "ad mode" automatically enters the decimal place when entering the number on the keyboard. If you enter "123", the displayed ammount will be "1.23". If you enter "1", the display will read ".01". This is a useful setting when adding a list of numbers in a dollars/cents format, however, be careful, if entering a whole dollar ammount "three dollars" be sure to enter the decimal point, or enter the number as "300". If you don't, the result will be ".03", instead of the 3 dollars you intended.
If I am not mistaken you are trying to set your decimal in dollars and cents correct? Well, if I am understanding your question correctly; you move tab that has F 6 3 2 1 0 set that to the 2 and then there is a tab that says "K * A make sure that is set to the A as well. Hope that helps.
Set the +43210F switch to + (or 2).
On some models it is A43210F, then use A (or 2).
+ mode will let you enter numbers (monetary) without the decimal point and assumes cents; 2 mode will just round to 2 decimals, but you must enter the decimal.