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The equivalent of the EE or EXP button on the Casio Fx-115ES is marked
as x10^X. It is located at the bottom right of the key pad left of the =
key.
To enter the power of 10 in a number written in scientific
notation, you press the x10^X button followed by the exponent. If the
exponent is negative you press the change sign key first [(-)] , then
the one or 2 digits in the exponent.
Example Enter the mass of the proton m_p in kilograms 1.6726217 [x10^X] [(-)]27 [=]
In grams the value above is multiplied by 1000.
or 1.6726217 [x10^X] [(-)]24 [=]
Since the calculator has the physical constants (the FX-991ES definititely has them)
Display the proton mass in kilograms
[SHIFT ][7] to open the constants catalog,
type 01 for the proton mass, then press the [x^-1].
1 kg is about 2.2 punds. To convert from pounds to kg you must divide by 2.2. 1 pound=1/2.2 kg = 0.45454545 kg. To convert from kilogram to pounds multiply by 2.2
In mathematics, a division is called a division by zero if the divisor is zero. Such a division can be formally expressed as a / 0 where a is the dividend. Whether this expression can be assigned a well-defined value depends upon the mathematical setting. In ordinary (real number) arithmetic, the expression has no meaning, as there is no number which, multiplied by 0, gives a (a?0).
In computer programming, an attempt to divide by zero may, depending on the programming language, generate an error message or may result in a special not-a-number value (see below).
Historically, one of the earliest recorded references to the mathematical impossibility of assigning a value to a / 0 is contained in George Berkeley's criticism of infinitesimal calculus in The Analyst; see Ghosts of departed quantities.
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