Question about Casio FX-115ES Scientific Calculator

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I am trying to use this calculator to do Organic chemistry and general chemistry problems which involve very large numbers and very small numbers or various numbers to both negative and positive powers. When I try to do a calculation such as 1*10(-14) divided by 3.0 * 10(-12)power. I get a completely wrong number. and the answer is displayed in fraction format!! Please help. what function do I need to be in to get regular anwers in sci notation if they need to be?

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  • brownbutterf Sep 12, 2010

    I plugged in 1x10 the powers button , then the (-) to the left of the calc 14/ divided by 3.3 x10 powers button (-) on left hand side 12. This time I got syntax error, other times i get 1.67 or 3.0 x 10 -27. I was previously using a ti-36x ive been using since high school, I just cant understand this one? I dont understand what the problem is.

  • brownbutterf Sep 12, 2010

    when I try your method i get syntax error. What mode should I be in?Comp, Complex, Math, MathIo .

  • brownbutterf Sep 12, 2010

    i dont even know if it is adding the exponents, because -14 - -12 = should equal -3
    because the exponenets are involved in division?

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Make sure you use the (-) key in the left column above the RCL key to enter negative exponents, not the - key which subtracts.

Do get all results in decimal instead of fraction notation, press SHIFT [SETUP] 2 to select LineIO mode.

Posted on Sep 12, 2010

  • 3 more comments 
  • brownbutterf Sep 12, 2010

    it still gives me an incorrect answer. In the calculator I am trying to solve: 1.0*10 -14power / 3.3 *10 -12 power. The answer it gives me is 3.03 *10 to the -27 power. That is an incorrect answer. The answer is 3.03 *10 to the -3 power. That answer would be completely incorrect on the exam. I dont understand what the problem is?

  • kakima Sep 12, 2010

    Exactly what keys are you pressing and what result do you get?

    1 x10^x (-) 1 4 / 3 . 3 x10^x (-) 1 2 / =
    gives me 3.03030303*10(-3)

    The x10^x key is just to the right of the decimal point.

  • kakima Sep 12, 2010

    Sorry, I didn't see the number you gave. The result you give is what I get if I omit the (-) before the 12 in the second number.

  • kakima Sep 12, 2010

    Sorry. The second / (right before the =) doesn't belong. I get the same result in LineIO and MthIO (after converting the fraction to decimal), real and complex.

  • kakima Sep 12, 2010

    -14 - -12 is -2. 1 / 3.3 is 3.03 10^(-1), thus the exponent of the result is -3. If the -12 is replaced by 12 the difference is 24, resulting in an exponent of -27.

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