EL-9900 Graphing Calculator
Fractions and Decimals
To convert a decimal into a fraction, form the numerator by multiplying the decimal by 10n, where n is the number of digits after the decimal point. The denominator is simply 10n. Then, reduce the fraction to its lowest terms.
Example
Convert 0.75 into a fraction.
Before There may be differences in the results of calculations and graph plotting depending on the setting. Starting Return all settings to the default value and delete all data.
We recommend using the Basic keyboard to calculate fractions.
Step & Key Operation | Display | Notes |
1Choose the manual mode for reducing fractions.
2nd F 
SET UP 
H 
2
2Convert 0.75 into a fraction.
CL 
0 
. 
7 
5 
➞b/c 
ENTER
3Reduce the fraction.
Simp 
ENTER
4Enter 3 to further reduce the fraction.
Simp 
3 
ENTER
5Enter 5 to reduce the fraction.
Simp 
5 
ENTER
The fraction can be reduced by a factor of 5.
The fraction cannot be re- duced by a factor of 3, even though the numerator can be. (15 = 3 x 5)
0.75 = 3/4
The
