Note that multiplication and division have priority to addition and subtraction. In other
words multiplication and division will occur before addition and subtraction.
Constant Multiplication: 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 priority 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 multiplication)
a x b — c =
— c (Constant subtraction)
3. Use of parenthesis
The parentheses keys are needed to cluster together a series of operations when it is
necessary to override the priority system of algebra. When parentheses are in use on the
EL-512 the symbol ( ) will appear in the display.
Calculations in parentheses have priority over other calculations. Parentheses can be
used up to 15 times in a single level. Calculations within the inner-most set of paren
theses will be calculated first.
Calculate: 12 + 42 4-18-6)
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 Q3 keys located just before the [= ] key can be omitted.
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