hp calculators
HP 17bII+ Chain Calculations
The open parentheses is inserted here because ‘18’ is going to be added to the result of the rest of the arithmetic operation in the
numerator. That is, before we can add ‘18’ we have to get the result of ‘12’ times the result of ‘240’ minus ‘3.’
12 18.00+(12
x 18.00+(12.00x
( 18.00+(12.00x(
The additional open parentheses is necessary here because you have to calculate what is inside the parentheses of the problem -
the ‘240’ minus ‘3’ - before you multiply by the ‘12.’
240 18.00+(12.00x(240
- 18.00+(12.00x(240.00-
3 ... .00(12.00x(240.00-3
) 18.00+(12.00x237.00
The closing of the second open parentheses (the one to the right) calculates what is inside of that parentheses, ‘237,’ the result of
subtracting ‘3’ from ‘240.’
) 18.00+2,844.00
The closing of the first open parentheses (the one to the left) calculates the result of ‘12’ times ‘237.’
÷ 2,862.00÷
Hitting an arithmetic operator, in this case the division key, completed the pending addition in the numerator and indicated the result
in the display before showing the division sign.
75 2,862.00÷75
= 38.16
Note that if you started the above problem by working inside of the parentheses you could solve the problem with less keystrokes:
Keystrokes Display
240 240
- 240.00-
3 240.00-3
x 237.00x
As shown in the previous calculation, when an arithmetic operation is pending and not shielded by parentheses, the calculator will
complete that pending operation if you key in a subsequent arithmetic operator. So, in the above we had “240 - 3” pending when we
keyed in the subsequent “x,” which caused the calculator to perform the subtraction as the “x” was brought in.
12 237.00x12
+ 2,844.00+
18 2,844.00+18
÷ 2,862.00÷
75 2,862.00÷75
= 38.16
hp calculators - 3 - HP 17bII+ Chain Calculations
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