20 Most Recent HP 12c Calculator - Page 6 Questions & Answers

Sorry, but the 12C doesn't have a fraction mode.

Press the CHS (CHange Sign) key.

That's the low battery indicator. Put in a fresh set of batteries and it will go away.

Press g [END] END is the g-shift of the 8 key.

The calculator is set to handle payments at the beginning of the period instead of at the end. To switch to the end mode, press g END (END is the g-shifted function of the 8 key).

Put in the number you want the square root of, then press g [square-root]. g is the blue shift key (third key from the left on the fourth (bottom) row of the keyboard). square-root is on the 1/x key (second key from the left on the second row of the keyboard).

Use the square root function. It's the g-shifted function of the 1/x key (second key from the left on the second row).

An acute angle is an angle measuring less than 90 degrees.

Sixteen (16) ounces in a pint.

What do you mean by "ounce"? There are various units of mass and volume called "ounce." One English ounce is a sixteenth of an English pound. One troy ounce is a twelfth of a troy pound. A US ounce is a sixteenth of a pint.

I take it you mean a 12C Platinum. Press f ALG. ALG is the f-shifted function of the EEX key, just above the double-size ENTER key. This will switch the 12C Platinum from RPN mode to Algebraic mode, and ALG indicator will light up instead of the RPN indicator. To switch back to RPN, press f RPN. RPN is the f-shifted function of the CHS key just above the EEX key.

Use the x^2 function on the g-shifted '*' key (multiplication). Press 4 g * Alternative, just multiply 4 by 4.

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I checked the manual, the image of the face of the calculator and there is no way to change the entry mode from RPN to Algebraic. Your calculator is still in RPN, it is the only mode it has. Reset it.

Press and release f, then press and release 4.