10-KEY
Adding Machines
Cash Registers
Computer Number Pad
Who uses the 10-Key?
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•
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•
•
accountants
bookkeepers
payroll workers
Statisticians
computer
operators
• architects
• estimators
• tellers
• military office
personnel
• bankers
• secretaries
• word processors
• other workers
• parents
Most of these people
have learned to
operate the ten-key
without watching their
hands or looking at the
keyboard.
This tremendous little machine
can also subtract, multiply, and
divide automatically with the
press of a key!
People who use TOUCH
OPERATION on the ten-key are
very fast and usually make
fewer mistakes.
Remember
You will be FASTER if you DON’T
LOOK.
The Basics. . .
Decimal Lever
• Whenever you are working with dollars and
cents or whenever you are working with a
decimal point, you will need to adjust the
DECIMAL LEVER on your ten-key. Most
decimal levers allow you to set the machine
for 1 or more decimal places. (This is how
many numbers will print after the decimal
point.)
• You need to set the decimal lever to “2
decimal places” so that your answers will be
rounded to the nearest hundredth as shown
below:
29.00 ÷ 7 = 4.15
The Keys. . .
A ten-key calculator has three rows
of number keys.
A zero (0) key and function keys like
add (+), subtract (-), multiply (x), and
divide (÷).
There are other keys to subtotal (+),
to total (*), to clear ( C ), and clear
entry (CE).
Home Row – 4, 5, & 6
• Position your right hand (even if you
are left handed) over the keys.
• Place your second finger on the 5.
Can you feel the raised bump. That
dot is to help you know if your
fingers are on the right keys.
• Place your first finger on the 4
key.
• Place your third finger on the 6
key.
• Place your little finger above the
add (+) key.
• Your thumb will operate the zero
(0) key.
• Press the Total Key (*) or (*T)
with the finger closest to it.
• Not all calculators have the
Total Key in the same place.
• Striking the Total Key before
each problem clears (or cleans)
the machine memory.
• Enter the numbers in the first
line of the problem and press
the Add Key (+). Continue
entering numbers until you
have the entire problem in the
machine.
TOP ROW – 7 8 9
• Place your right hand in the
HOME POSITION –first finger
covering the 4 key, second
finger covering the 5 key, and
the third finger covering the 6
key. Be sure you feel the
raised dot under your middle
finger.
• With your right hand in home
position, reach UP to the 7 key
with your first finger.
• Keep your second and third
fingers in the home positions.
• Strike the 7 key then move your
first finger back to its home row
position.
• Move your second finger from
the 5 key UP to the 8 key then
back to its home row position.
• Move your third finger from the
6 key UP to the 9 key then back
to its home row position.
• If you make a mistake, zero out the
*
problem by pressing the
key
twice. Then begin the problem
again.
• Do not tear off your adding machine
tape. At the store, the tape rolls up
in the machine until the end of the
day. You cannot tear it off. So do
not tear it off here.
BOTTOM ROW – 1 2 3
• Place your right hand in HOME
POSITION – first finger
covering the 4 key, second
finger covering the 5 key, and
the third finger covering the 6
key. Be sure you feel the
raised dot under your middle
finger.
• With your right hand in home
position, reach DOWN to the 1
key with your first finger. (Keep
your second and third fingers in
their home positions.)
• Move your second finger from
the 5 key DOWN to the 2 key.
• Move your third finger from the
6 key DOWN to the 3 key.
0 AND REVIEW
• Place your right hand in HOME
POSITION.
• Move your right thumb DOWN
to the 0 (zero) and the 00
(double zero). The double zero
is used when entering numbers
such as 100.
Subtract
• The Subtraction Key (-) is
usually located to the right of
the 6 and the 9 keys.
• You should press the
Subtraction Key with the little
finger on your right hand.
• Enter the TOP number and press
the Add Key (+).
• Enter the BOTTOM number and
press the MINUS KEY (-).
• In most calculators, this number
will print out in red.
• Press the TOTAL KEY.
Multiplication
• The Multiplication Key (x) is
located on the right side of the
calculator.
To multiply on a ten-key,
follow these steps:
• Enter the top number
(multiplicand).
• Press the Multiplication Key (x).
• Enter the bottom number
(multiplier).
• Press the Equals Key (=). (Use
your right index finger to strike
the = key.)
To begin, remember to
Clear the
machine (*)
A final note. . .
When working on problems in
school it may be necessary to
number your problem.
Example:
1. 5 + 5 =
2. 12 / 2 =
3. 13 * 3 =
To number your
problem:
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•
•
Enter the number of the problem
you are working on.
Press the Non-add key (#) with
your index finger.
The number and a non-add
symbol will print on the left side
of the tape, but the number will
not be added into the machine
memory.