Datexx DD-880 Owner's Manual

Owner's Manual 
Please read before using.
Features
Dual Solar/Battery Power – built-in solar panel extends battery 
life by powering the calculator in the light.
Four Function Memory – includes addition, subtraction, recall, 
and clear.
+/– – Press to change the displayed number from positive (+) to 
negative (–) and vice versa. "–" appears when the number is 
negative.
MU – Mark up calculation.
GT – GT (Grand Total) lets you perform cash register calculations 
simply and quickly. Every time you press [=], the displayed 
number is memorized and "GT" appears. Press [GT] to display 
the sum of all memorized numbers.
 
To shift a displayed value digit by digit to the right, until you  
  get to the digit you want to re-input from.
Automatic Power Off – saves battery power by turning off the 
calculator if it is left unused for about 5-12 minutes.
Memory Functions
[M+]  Press to add the displayed number to memory, "M" is  
  displayed.
[M–]  Press to subtract the currently displayed number from  
  memory.
[MRC]  Press once to recall the number in memory. Press   
  twice to clear the memory.
Care
•  Avoid dropping the calculator and otherwise subjecting it to   
  severe impact.
•  Never bend or twist the calculator.
•  Never try to take the calculator apart.
•  Wipe the calculator with a soft, dry cloth to clean it.
Performing Calculations
  Example    Key Operation  Display
  6 + 7 = 13    [6] [+] [7] [=]      13
  10 – 4 = 6    [1] [0] [–] [4] [=]      6
  7 x 5 = 35    [7] [x] [5] [=]      35
  14 ÷ 7 = 2    [1] [4] [÷] [7] [=]      2
  √64 = 8    [6] [4] [√]      8
  Calculate 6% of 100
  [1] [0] [0] [x] [6] [%]     6
  Price 
= $20,
 add 8% tax
  [2] [0] [+] [8] [%]      21.6
  Original cost = $150,  [1][5][0][x][2][0][MU]     180
  mark up by 20%
  Selling price = $150,   [1][5][0][–][8][0][MU]     87.5
  cost = $80
  what is the mark up.
      80 x 9 =  720  [8] [0] [x] [9] [M+]      720
  –)  50 x 6 =  300  [5] [0] [x] [6] [M–]      300
  +)  20 x 3 =  60  [2] [0] [x] [3] [M+]      60
  =)    480  [MRC]      480
  8 x 6    [ON/AC] [8] [x] [6] [=]    48
  23 x 45    [2] [3] [x] [4] [5] [=]      1035
  =       [GT]      1083
Replacing the Battery
• 
Remove the screws that hold the back cover in place and remove  
  the cover and the old battery.
• 
Wipe the new battery with dry soft cloth and place it into the  
  calculator with the (+) side facing up.
• 
Press [ON/AC] to turn the power on.
Note:  A dead battery can leak and damage the
calculator if left in the battery compartment for long
periods.
DUAL POWER
CALCULATOR
DD-880

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