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Calculating with fractions – HP 48g Graphing Calculator User Manual

Page 197

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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

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