EC-443  (650-0597)               Operation             Faxback Doc. # 7535

Open the case and press ON/CA to turn on the calculator.

Use these examples as guides for entering specific kinds of calculations.

BASIC CALCULATIONS

 Calculation              You Press:              You See:

 69 + 58 = 127            69 [+] 58 [+]           127.

 5 x 23 =115              5 [x] 23 [=]            115.

 54 (divided by) 3 = 18   54 [divided by] 3 [=]   18.

 1/2 = 0.5                2 [divided by] [=]      0.5

MIXED CALCULATIONS

 Calculation              You Press:              You See:

 14 x 25 - 36 = 314       14 [x] 25 [-] 36 [=]    314.

 3 x (-3) = -9            3 [x] 3 [+/-] [=]       -9.

CONSTANT, POWER, AND SQUARE ROOT CALCULATIONS

 Calculation              You Press:              You See:

 7 + 3 = 10               7 [+] 3 [=]             10.

 5 + 3 = 8                5 [=]                   8.

 7 - 3 = 4                7 [-] 3 [=]             4.

 5 - 3 = 2                5 [=]                   2.

 260 x 12.3 = 3198        260 [x] 12.3 [=]        3198.

 260 x 45.6 = 11856       45.6 [=]                11856.

 78.9 (div.) 50 = 1.578   78.9 [div.] 50 [=]      1.578

 96.3 (div.) 50 = 1.926   96.3 [=]                1.926

 2 (3rd power) = 8        2 [x] [=] [=]           8.

 (sq.root) 2 = 1.4142135  2 [sq.root]             1.4142135

PERCENTAGE CALCULATIONS

 Calculation              You Press:              You See:

 15% of $129.96           129.96 [x] 15 [%]       19.494

 7.5% of 3000             3000 [x] 7.5 [%]        225.

ADD-ON AND DISCOUNT PERCENTAGE CALCULATIONS

 Calculation              You Press:              You See:

 Add 15% onto 100         100 [+] 15 [%]          115.

 Discount 15% from 100    100 [-] 15 [%]          85.

MEMORY CALCULATIONS

To store a value in memory, first press MRC (memory recall) twice to clear
the memory.  Then enter the number or calculation and press M+.

To add a value to the current memory value, enter the number or
calculation you want to add and press M+.  The calculator totals the
current calculation (if needed) and adds that value to memory.

To subtract a value from the current memory value, enter the number or
calculation you want to subtract and press M-.  The calculator totals the
current calculation (if needed) and subtracts that value from memory.

To recall the value from memory, press MRC once.

EXAMPLE:

 Calculation              You Press:              You See:

 2392 + 576               [MRC][MRC]              
----------- -73             786 [M+]              M       786
  786 - 432                 432 [M-]              M       432
                            2392 [+]              M      2392
 = -64.61582                576 [div.]            M      2968
                               [MRC]              M       354
                                 [-]              M 8.3841807
                              73 [=]              M  64.61582
                                                  -   

CORRECTING ENTRY ERRORS

If you enter an incorrect value, press CE/C once.  Then enter the correct
value and proceed with your calculation.  If you press an incorrect
function key (+,-,x,div.), press the correct key and continue.

ERRORS

E (ERROR) appears at the lower left of the display when:

   A calculation result exceeds eight digits

   A memory calculation exceeds eight digits (however, memory contents are
   not changed)

   You try to divide by zero

   You try to take the square root of a negative number

If E appears, press CE/C to clear the error.  Then re-enter the 
calculation.

Estimating Calculation Results

If you perform an operation that results in a calculation which exceeds
eight digits, you can estimate the correct result (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 to the right of the number as many zeros as there were digits to
    the left of the decimal point.

For example, if the display shows E1.0142064, the approximate answer is
101,420,640.

(br/all-9/15/94)