3–EN
Display formats
The fixed point, scientific, and engineering formats use a fixed number of decimal
places to display numbers.
Example
Function Key
Display
Fix the display at 3 decimal
places.
[2nd] [FIX] [3]
0.000
Remove fixed-decimal setting. [2nd] [FIX] [•]
0.
Perform 2 ÷ 3 = 0.666666666
and select scientific notation.
2 [÷] 3 [=]
[2nd] [SCI]
0.666666666
6.6666666
–01
Restore standard notation
(floating decimal) format.
[2nd] [FLO]
0.
Correction
If you have made a mistake when entering a number (but you have not yet pressed
an arithmetic operator key), just press [CE/C] to clear the last entry then input it again,
or delete individual digits by using the backspace key
[←]
.
Overflow / Error conditions
A message “Error“ is shown on the display when any of the following conditions
occur and further calculation becomes impossible. Just press
[CE/C]
or
[ON/AC]
to
release those overflow or error indicator and the subsequent calculation can then be
performed.
• Number, result, or memory sum x, where |x| > 9.999999999 × 10
99
.
• More than 4 pending operations (2 when STAT is displayed) or more than 15 open
parentheses per pending operation.
• For x!: x not an integer between 0 and 69.
• For y
x
: y and x = 0 or y < 0 and x not an integer.
• For
x
√y: x = 0 or y < 0 and x not an odd integer.
• Dividing by 0.
• For √x: x < 0.
• For LOG or LN: x ≤ 0.
• For TAN: x = 90°, –90°, 270°, –270°, 450° etc.
• For SIN
–1
or COS
–1
: |x| > 1.
• For TANH
–1
: |x| ≥ 1.
• For R ►P: x or y has exponent > 63.
• For nCr or nPr: n or r are not integers ≥ 0.
• More than 9999 statistical data points.
• Statistical data point x, where |x| ≥ 1E64.
•
[2nd] [∑–]
to remove the only data point.
• Calculating , σxn, σxn or σxn
–1
with no data points or σxn
–1
with one data point.
•
[2nd] [CSR]
with no data points.
Order of Operations
Each calculation is performed in the following order of precedence:
1. Expressions inside parentheses.
2. Single-variable functions that perform the calculation and display the result
immediately: sin, cos, tan, sin
–1
, cos
–1
,tan
–1
, log, ln, x
2
, √,
p
,
3
√, x!, %, ENG,
reciprocals or angle conversions.
3. Combinations and permutations.
4. Exponentiation and roots.
5. Multiplication and division.
6. Addition and subtraction.
Basic calculation
Taste
[+/–]
changes sign of value just entered.
Example
Function Key
Display
23 + 4.5 – 53 = –25.5
23 [+] 4.5 [–] 53 [=]
–25.5
56 × (–12) ÷ (–2.5) = 268.8
56 [×] 12 [+/–] [÷] 2.5
[+/–] [=]
268.8
12369 × 7532 × 74103 =
6.9036806 × 10
12
12369 [×] 7532 [×]
74103 [=]
6.903680613
12
(1 × 10
5
) ÷ 7 = 14285.71429
5 [2nd] [10
x
] [÷] 7 [=]
14285.71429
1 + 2 – 3 × 4 ÷ 5 + 6 = 6.6
1 [+] 2 [–] 3 [×] 4 [÷] 5
[+] 6 [=]
6.6
2 + 3 × ( 4 + 5 ) = 29
2 [+] 3 [×] [(] 4 [+] 5 [=]
Key
[=]
closes all open
parentheses
29.
Percents
Example
Function Key
Display
Percentage
26% of $15.00
15 [×] 26 [2nd] [%] [=]
3.9
Add-On
15% add-on of $36.20
36.2 [+] 15 [2nd] [%] [=]
41.63
Discount
4% discount of $47.50
47.5 [–] 4 [2nd] [%] [=]
45.6
Ratio
Ratio of 75 to 250
75 [÷] 250 [2nd] [%] [=]
30.
Memory
The calculator has 3 memories. When a memory contains a number other than 0, M1,
M2, or M3 displays. To clear a single memory, press
[0] [STO] [1]
,
[0] [STO] [2]
, or
[0] [STO] [3]
. To clear all 3 memories, press
[ON/AC]
.
Note: Memory contents are not retained when power is turned off.
Example
Function Key
Display
Stores displayed value
in memory 1.
123 [STO] 1
M1
123.
Recalls value in memory 1.
[RCL] 1
M1
123.
Adds displayed value
to memory 1.
25 [2nd] [SUM] 1
[RCL] 1
M1
M1
25.
148.
Exchanges displayed
and memory values.
369 [2nd] [EXC] 1 [2nd]
[EXC] 1
M1
M1
148.
369.
Memory calculations
4 + M1 x 5 =
8 + SIN (M1) =
9 – (M1)
2
=
Left bracket must be
entered before pressing
[RCL]
.
4 [+] [(] [RCL] 1 [×] 5 [=]
8 [+] [(] [RCL] 1 [SIN] [=]
9 [–] [(] [RCL] 1 [x
2
] [=]
M1
M1
M1
1849.
8.156...
–136152.
Summary of Contents for ECO 30
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