Casio FX-991ES User Guide - Page 23

Fraction Calculations - appendix

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Omitting a Final Closed Parenthesis You can omit any closed parenthesis ( ) ) immediately preceding operation of the = key at the end of a calculation. This is true only in the case of Linear format. Example: (2 + 3) × (4 - 1) = 15 LINE (2+3)* (4-1= k Fraction Calculations How you should input fractions depends on the input/output format that is currently selected. Math Format Improper Fraction Mixed Fraction 7 3 2 1 3 ('7c3) (1'(()2e1c3) 7 { 3 2 { 1 { 3 Linear Format Numerator Denominator Integer Part Denominator Numerator (7'3) (2'1'3) • Under initial default settings, fractions are displayed as improper fractions. • Fraction calculation results are always reduced before being displayed. Appendix -2 + -1 = -7 326 3 -1 + 1 -2 = 4 - 11 (Fraction Display Format: ab/c) 4 3 12 4 - 3 -1 = -1 (Fraction Display Format: ab/c) 22 • If the total number of digits used for a mixed fraction (including integer, numerator, denominator, and separator symbols) is greater than 10, the value is automatically displayed in decimal format. • The result of a calculation that involves both fraction and decimal values is displayed in decimal format. Switching between Improper Fraction and Mixed Fraction Format Pressing the 1f( a -bc ⇔ -dc ) key toggles the display fraction between mixed fraction and improper fraction format. E-21

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E-21
Omitting a Final Closed Parenthesis
You can omit any closed parenthesis (
)
) immediately preceding
operation of the
=
key at the end of a calculation.
This is true only in the case of Linear format.
Example:
(2 + 3)
×
(4 – 1) = 15
LINE
(2+3)*
(4-1=
k
Fraction Calculations
How you should input fractions depends on the input/output format
that is currently selected.
• Under initial default settings, fractions are displayed as improper
fractions.
• Fraction calculation results are always reduced before being
displayed.
Appendix
2
1
7
<#001> — + — = —
3
2
6
1
2
11
<#002> 3 — + 1 — = 4
—
(Fraction Display Format: ab/c)
4
3
12
1
1
4 – 3 — =
—
(Fraction Display Format: ab/c)
2
2
• If the total number of digits used for a mixed fraction (including
integer, numerator, denominator, and separator symbols) is greater
than 10, the value is automatically displayed in decimal format.
• The result of a calculation that involves both fraction and decimal
values is displayed in decimal format.
Switching between Improper Fraction and Mixed
Fraction Format
Pressing the
1
f
(
a
—
⇔
—
b
c
d
c
) key toggles the display fraction
between mixed fraction and improper fraction format.
Denominator
Improper Fraction
Mixed Fraction
Math
Format
Linear
Format
7
3
1
3
2
7
{
3
2
{
1
{
3
Numerator
Denominator
Integer Part
Numerator
(
'
7
c
3
)
(
1
'
(
(
)
2
e
1
c
3
)
(
7
'
3
)
(
2
'
1
'
3
)