HP HP-25 - Chain Calculations Explained

So, means square root of the displayed number, means
1
displayed number ’
— elc.
Thus, to calculate 36:
Press Display
3
3.00
6 X, the displayed number, is now 6.
729.00 The answer.
Now try the following problems using the [0 ]key, keeping in
mind the simple rules for two-number functions:
16* (16 to the 4th power) =
81> (81 squared) (You could
also have
done this as a
one-number
function
using .)
2255 (Square root of 225) = (You could
also have
done this as a
one-number
function by
using J)
216 (2 to the 16th power) =
16-2% (4th root of 16) =
Chain Calculations
The speed and simplicity of operation of the HP-25’s Hewlett-
Packard logic system become most apparent during chain cal--
culations. Even during the longest of calculations, you still per-
Sformonly one operation at a time, and you see the results as you
calculate—the Hewlett-Packard automatic memory stack
stores up to four intermediate results inside the calculator until
you need them, then inserts them into the calculation. This