© 2000 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
TI-15: A Guide for Teachers
A
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2
Quick Reference to Keys
(Continued)
A
Key Function
£
When you divide a positive whole number by a positive whole number using
£
, the result is displayed in the form
Q r R
, where
Q
is the quotient
and
R
is the remainder. If you use the result of integer division in a
subsequent calculation, only the quotient is used; the remainder is
dropped.
When pressed after entering a number, designates the numerator of a
fraction. The numerator must be an integer. To negate a fraction, press
M
before entering numerator.
¥
When pressed after entering a number, designates the denominator of a
fraction. The denominator of a fraction must be a positive integer in the
range 1 through 1000. If you perform a calculation with a fraction having
a denominator greater than 1000, or if the results of a calculation yield
a denominator greater than 1000, the TI-15 will convert and display the
results in decimal format.
Separates a whole number from the fraction in a mixed number.
¢
Displays a menu of settings that determine how fraction results are
displayed.
•
U n/d
(default) displays mixed number results.
•
n/d
displays results as a simple (improper) fraction.
If
N/d
"
n/d
is displayed after you convert a fraction to a mixed number,
you can further simplify the fractional portion of the mixed number.
¢$
Displays a menu to select the method of simplifying fractions:
•
Man
(default) allows you to simplify manually (step-by-step).
•
Auto
automatically reduces fraction results to lowest terms.
¤
Enables you to simplify a fraction.
§
Displays the factor that was used to simplify a fraction.
¦
Converts a mixed number to an improper fraction or an improper fraction
to a mixed number.
Ÿ
Converts a fraction to a decimal, or converts a decimal to a fraction, if
possible. Converts
p
to a decimal value.
ª
Enters a percentage.
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