Sharp EL-9900 Calculator User Manual


  Open as PDF
of 1
 
EL-9900 Graphing Calculator
Fractions and Decimals
To convert a decimal into a fraction, form the numerator by multiplying the decimal by 10
n
,
where n is the number of digits after the decimal point. The denominator is simply 10
n
. Then,
reduce the fraction to its lowest terms.
Convert 0.75 into a fraction.
Example
There may be differences in the results of calculations and graph plotting depending on the setting.
Return all settings to the default value and delete all data.
We recommend using the Basic keyboard to calculate fractions.
Choose the manual mode for
reducing fractions.
1
NotesStep & Key Operation Display
H2
2nd F
SET UP
Convert 0.75 into a fraction.
2
ENTER
CL
0
➞b
/c
.
75
The fraction can be reduced
by a factor of 5.
Reduce the fraction.
3
ENTER
Simp
Enter 3 to further reduce the
fraction.
The fraction cannot be re-
duced by a factor of 3, even
though the numerator can be.
(15 = 3 x 5)
4
ENTER
Simp
3
Enter 5 to reduce the fraction.
0.75 = 3/4
5
ENTER
Simp
5
The EL-9900 can easily convert a decimal into a fraction. It also helps
students learn the steps involved in reducing fractions.
Before
Starting