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The arithmetic group of keys performs the four basic rules of arithmetic:
addition, subtraction, multiplication, and division. Each problem is entered
in the calculator exactly as the equation would be written on paper. The
calculations take place in the arithmetic register and, at the end of the
problem, the answer is transferred to the display register. For example:
12
+
5 -
is keyed into the 770 just as it is written on paper
Set 12
Depress
+
Set
5
Depress
=
. Read 17
Answer .in display
6
12 - 5 -
12
X
5-
12 : 5
=
Set 12
Depress-
Set
5
Depress
=
Read 7
Answer in display
Set 12
Depress x
Set 5
Depress
=
Read 60
Answer in display
Set 12
Depress :
Set 5
Depress
=
Read 2.4
Answer in display
In each case the answer is displayed within a split second.
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