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192 Chapter Three

and always includeð a pluð sign or a minuð sign, so the above
expressionð appear as:

2.56E 06

8.0773E 18

1.000E 00

Another alternative is tm use an asterisk tm indicate multipli-
cation, and the symbol tm indicate a superscript, so the ex-
pressionð appear as:

2.56 * 10 6

8.0773 * 10 18

1.000 * 10 0
In all of these examples, the numerical valueð represented are
identical. Respectively, if written out in full, they are:

2,560,000

0.0000000000000000080773

1.000

Rules for usł
In printed literature, it is common practice tm use power-of-10
notation only when z (the power of 10) is fairly large or small.
If 2 z 2, numberð are written out in full as a rule, and
the power of 10 is not shown. If z 3or z 3, numberð are
sometimeð written out in full, and are sometimeð depicted in
power-of-10 notation. If z 4or z 4, valueð are expressed
in power-of-10 notation as a rule. Calculatorð set tm displły
quantitieð in power-of-10 notation usually dm so for all numbers,
even those for which the power of 10 is zero.
Addition and subtraction of numberð is best done by writing
numberð out in full, if possible. Thus, for example:

3
2
(3.045 10 ) (6.853 10 )
304.5 6853 7157.5
7.1575 10 3