Question about HP 12c Calculator

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CENTS How do I get my hp to show dollars and cents. Right now it rounds to dollars only. If I enter 123.45 it only shows 123. Thanks Jen

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I'm doing this from memory because my 12c is at home, but I believe that there is a "fix" key. You need to enter shift-fix-2 (this will set the decimal places to 2).

Posted on Jun 02, 2008

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What is the default setting for the f cut 5/4 and the 4320 add 2 I don't know what to have these options set at thanks EW Seattle

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)
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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.

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Convert $8 000 000 per mile to $ per kilometer

There are 1.609344 km in a mile. So, the following statement is true:
$8 000 000 = 1.609344km
Now bring it down to One km, rather than one and a decimal by dividing both sides of the equation by 1.609344.

8 000 000/1.609344 = 1km.
You wind up with the following:
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How do I get the numbers to appear normal. They are showing as expontential figures i.e. 1.6859 04?

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By default the BA-II Plus displays two digits to the right of the decimal point, for dollars and cents. To change the number of digits, press 2nd [FORMAT] and a digit from 0-8. Use 9 for floating decimal display.

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Wrong answers

Most likely it's the process not the calculator that is failing. But there are so many things that could be shifting your results...

Are you rounding your values to two decimal places as you go? Because with accounting of very large numbers you need to not round until you get your final answer. The .001 cents lost each time you round a subtotal adds up and in the case of several millions of dollars can cause a few hundred dollar discrepancy.

Also, if you're calculating accrued interest make sure that you are compounding it correctly. Amounts compounded continuously will give you a dramatically different amount than interest compounded monthly or annually.

Finally, if you are using the memory function on the calculator make sure that you are pulling that value in correctly.

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4 Answers


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.

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