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Note that m ultiplication and division have priority to addition and subtraction. In other
words m ultiplication and division w ill occur before addition and subtraction.
Constant M ultiplication: The first number entered is the multiplicand.
Key in:
3 [X ] 5 Q=]
Answer:
15
Key in:
10 [= ]
Answer:
30
Constant Division: The number entered after the division sign is the divisor.
Key in:
15 GE] 3 [ = ]
Answer:
5
Key in:
30 [= ]
Answer:
10
Note:
The machine retains some calculations depending on p rio rity level.
Accordingly, in successive calculation the operator of the last calculation and
the last numerical value are handled as a calculating instruction and a constant
for constant calculation, respectively.
a + b x c =
+bc
(Constant addition)
a x b + c =
T C
(Constant division)
a + b x c =
-a. x
b
(Constant m ultiplication)
a x b — c =
— c
(Constant subtraction)
3.
Use o f parenthesis
The parentheses keys are needed to cluster together a series of operations when it is
necessary to override the prio rity system of algebra. When parentheses are in use on the
EL-512 the symbol (
) w ill appear in the display.
Calculations in parentheses have prio rity over other calculations.
Parentheses can be
used up to 15 times in a single level. Calculations w ith in the inner-most set of paren
theses w ill be calculated first.
Calculate:
12 + 42 4 - 1 8 - 6 )
Key in:
12 E
42 0
[ ] ] 8 0
6 Q ] [ = ]
Answer:
33
Calculate:
126 + [ (3 + 4) x (3 - 1) ]
Key in:
126 f f i
Q ] 0
3 (± ) 4 Q ] ®
Q ] 3 B
1 ' f f i Q ] @
Answer:
9
==-
—
can be omitted
Note:
The Q 3 keys located just before the [ = ] key can be omitted.
13
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