HP 48g Graphing Calculator - Manual (Page 197)

Calculating with Fractions
A fraction is an algebraic representation of an arithmetic operation
that hasn’t yet been evaluated. For example, the fraction | is a
means of representing the result of a division operation 4^3 without
actually dividing. The mixed fraction 4| represents the algebraic
operation 4 + (5 -t- 6 ). The HP 48 uses these algebraic representations
to display fractions:
To enter a fraction:
B Using the Equation Writer:
1. Press EQUATION).
2. Type ill the fraction. Press to begin a numerator and m (or
®) to move from the numerator to the denominator.
3. Press [ENTER]
B Using the command line:
1. Press
a
(because the fraction is an algebraic).
2. Type in the fraction onto the command line.
3. Press
( E N T E R ) .
16
1. Enter the fractions onto the stack in the same order as you would if
they were decimal numbers.
2. Execute the operation ((®, (3) 0 )-
3. Press (EVAL) to convert the expression into a decimal answer.
To convert a decimal into a fraction;
1. Put the decimal on level 1 of the stack.
2. If necessary, change the display mode. The accuracy of the
fractional approximation is dependent on the display mode. If the
display mode is
Std,
the approximation is accurate to
11
significant
digits. If the display mode is n Fix, the approximation is accurate
to n signihcant digits.
3. Press P^(SYMBOLIC ) [NXT) “HJ .
Date, Time and Fraction Arithmetic 16-5