EC-2033 LCD Math Tutor Calculator
(650-0528) Operation Faxback Doc. # 18166
YOUR CALCULATOR'S CONTROLS
Control Function
ON/AC Turns on the calculator and clears all
calculations
OFF Turns off the calculator
CE/C Clears calculation entries
EX1 Enters the Automatic Quiz
EX2 Enters the Self-Setting Quiz
+, -, x, / Perform the four standard mathematical
calculations
= Displays the result of any calculation
entered
M+ Add results of calculations to memory
M- Subtracts results of calculations
from memory
M R/C Recalls and clears the memory contents
SINGLE/MULTI-LINE Switches the display mode
EMR Enters and displays the phone numbers
TEL
< > Move from digit to digit
/\ \/ Scroll from screen to screen
TURNING ON THE CALCULATOR
To turn on the calculator, simply press ON/AC. To turn it off, press OFF.
NOTES: Your calculator automatically turns off about 7 minutes after you
make the last entry.
Your calculator loses any pending calculations when you turn it
off, or when it automatically turns off.
CORRECTING ENTRY ERRORS
The calculator performs the function of the last function key pressed.
For example, if you press 7 x / + 5 =, the calculator performs
7 + 5 = and 12 appears on the display.
To clear numeric entry errors, press CE/C once to clear the last entry.
Press CE/C twice or ON/AC once to clear the entire problem.
MULTI-LINE MODE
In the multi-line mode, the calculator displays the calculation step by
step. When you turn on the calculator, the EC-2033 is automatically in
the multi-line mode and displays 0.
NOTES: To go from single-line to multi-line mode, press SINGLE/MULTI-LINE.
You cannot use the decimal point in the multi-line mode.
The EC-2033 displays E (Error) if you make an invalid entry.
Press CE/C to remove the E from the display.
When you do multiplication and division calculations, the equation's
first number cannot exceed 5 digits and the second cannot exceed 3 digits.
Example:
Calculation You Press You See
99999 x 999 = 99999 x 99999
9989001 999 = x 999
_ _ _ _
899991
899991
899991
- - - - -
99899001
When you do addition calculations, if the equation has more than 5 values,
the EC-2033 displays and calculates the result of the first five values.
From then on, it keeps a running total and shows only the previous total,
the number you're adding, and the overall total.
Example:
Calculation You Press You See
1 + 2 + 3 + 4 1 + 1
5 + 6 = 21 2 + 2
3 + 3
4 + 4
5 + + 5
- - - -
15
6 = 15
+ 6
- - - -
21
When you do subtraction calculations, if the equation has more than two
values, the EC-2033 displays and calculates the result of the first two
values, subtracts the next value, takes that result and subtracts the
next, and so on.
Example:
Calculation You Press You See
100 - 4 - 6 = 100 - 4 - 6 100
60 = - 4
- - - -
96
96
- 6
- - - -
90
QUIZZES
Automatic Quiz
Follow these steps to take an arithmetic quiz with the problems the
EC-2033 randomly gives you.
1. Press EX1 (Exercise 1). The EC-2033 displays EX1 and the first
arithmetic problem.
2. Enter the answer to the problem.
NOTES: To move the cursor to the next line while entering the answer,
press =.
To correct a wrong digit entry, press > to delete digits, then
enter the correct numbers.
During multiplication, addition, and subtraction, to enter
more than one digit for the calculation result, enter the
numbers from right to left. For example, to enter 12 as the
result of 4 x 3, you should enter 2 and then 1.
3. Press = to see if you entered the correct answer.
If the answer is wrong, FALSE appears and the EC-2033 displays the
equation again. Try entering the correct answer. If you enter three
wrong answers, the EC-2033 displays AnS and the correct answer.
If the answer is correct on the first try, you get 3 points. Point 3
Acc 0003 appears on the display. If you get the correct answer on the
second try, you get 2 points. If you get the correct answer on the
third try, you get 1 point. The EC-2033 automatically totals and
displays the score.
4. After each correct answer, or the third incorrect answer, a new
problem appears on the display.
SELF-SETTING QUIZ
Follow these steps to set up your own arithmetic problems.
1. Press EX2 (Exercise 2) . data - - 00, and EX2 appear.
2. Set up the arithmetic equation. For example, enter 85 x 2 =. The
display shows:
EX2 85
x _ _ _ _ _ _ _ _ _ _2
-
3. Press =. data - - 01 and \/ or /\ appear. (data - - XX shows the
number of problems set up.)
4. Repeat Steps 2 and 3 to enter up to 25 equations.
NOTE: The EC-2033 displays FULL if you try to set up more than 25
equations.
To delete one equation, press \/or /\ to display the desired equation then press CE/C. delete y-n appears. Press < to select y then press =.
To delete all of the equations you stored, see "Resetting the Calculator,"
Faxback Doc.# , Preparation.
Follow these steps to take the quiz you set up.
1. Press EX2 (Exercise 2). data - - XX, and (scroll up and down arrows)
appear.
2. Press /\ or \/ to go to the equation you want to try to answer.
3. Enter your answer.
If your answer is correct, the EC-2033 displays correct.
If your answer is wrong, the EC-2033 displays FALSE and shows you the
correct answer.
4. For additional practice, press /\. The equation you just answered
incorrectly appears. Enter the correct answer.
5. To check your score, repeatedly press /\ or \/ until the score screen
at the end of the problems appears.
SINGLE-LINE MODE
In this mode, the EC-2033 displays calculation results without displaying
the full equations. Press SINGLE/MULTI-LINE to switch to the single-line
mode. Calculator appears at the upper left of the display.
Example:
Calculation You Press You See
1 + 2 + 3 + 4 = 1 + + 1
10
2 + + 3
3 + + 6
4 = + 10
Calculation Examples
Basic Mathematical Calculations
Calculation You Press You See
123 + 456 - 123 + + 123.
789 = -210
456 - - 579.
789 = -210.
78 x 45 / 23 = 78 x x 78.
152.60869
45 / 3'510.
23 = 152.60869
17.2 / 2.5 =
6.88 17.2 / / 17.2
2.5 = 6.88
Mixed Calculation
Calculation You Press You See
15.3 x 13.7 / 4
15.3 x x 15.3
+ 19 - 11 =
60.4025 13.7 / / 209.61
4 + + 52.4025
19 - - 71.4025
11 = 60.4025
Memory Calculation
Calculation You Press You See
(2392 + 576) M R/C M R/C 0.
/ (786 - 432)
- 73 = 786 M + M 786.
-64.61582
432 M- M 432.
+
2392 + M 2'392.
/
576 / M 2'968.
/
M R/C M 354.
-
- M 8.3841807
73 = M 64.61582
Calculation Errors
The EC-2033 displays E (Error) when:
You attempt to divide a number by 0.
A memory result exceeds eight digits.
(But, memory contents remain unchanged.)
The calculation result exceeds eight digits
to the left of the decimal point. This is an
overflow error.
Press CE/C to remove the E from the display.
Approximating Calculation Results
If you perform a calculation that results in an overflow error, you can
approximate the correct answer (to eight significant digits) by following
these steps.
1. Count the number of digits displayed to the left of the decimal point.
2. Remove the decimal point.
3. Add as many zeros to the end of the results as there were digits to
the left of the decimal point.
Examples:
Approximate
Calculation Display Answer
96857431 + E 1.0142064 101'420'640
4563211 = (add one
101'420'642 zero)
123456 x E 31.970165 3'197'016'500
25896 = (add two
3'197'016'576 zeros)
STORING TELEPHONE NUMBERS
Follow these steps to store up to five important telephone numbers.
1. Press EMR TEL (Emergency Telephone). Five icons and (scroll down arrow)
appear at the right side of the display. House flashes.
NOTE: House is for home
Book is for school
Truck is for medical help
Police Car is for the police
Fire Truck is for the fire station
2. Enter the home telephone number (up to 8 digits).
3. Press \/ to move to the second line.
Book flashes.
4. Follow Steps 2 and 3 to enter other phone numbers.
NOTE: If you enter an incoming phone number, press \/ or /\ to move to the
line you want to change, then enter the correct phone number.
5. Press EMR TEL again when you finish storing numbers.
6. Press CE/C to exit the EMR TEL display.
To recall the telephone numbers, press EMR TEL.
To change a stored telephone number, press EMR TEL until house flashes
and (scroll down arrow) appears. Press \/ to go to the line you want
to change. Enter the new telephone number, then press EMR TEL. Press CE/C
to exit the EMR TEL display.
(CS 11/17/95)