HP 35s Instruction Manual page 3

Using rpn mode

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HP 35s Using RPN Mode

Arithmetic calculations with two numbers

Now that the lengths of the two sides have been squared, it is necessary to add the two squares.

To add the two numbers, it is enough to press the add key.

In RPN mode addition takes the number from the X register, uses it, and puts the result in the X register, so the result is

seen on the lower line. This is like a function of one number, but because addition uses two numbers, it takes the

second number from the Y register. The number in the Y register is removed. There is a third stack register above Y,

called the Z register, and the number in the Z register moves down to the Y register.

Subtraction, multiplication and division work the same way. The number in X is subtracted from, multiplied by, or divided

into the number in Y. If the two numbers are in the wrong order, w can be used to exchange them.

To get the final answer, since this is a function of a single number, it is enough to press the ? function key.

Answer:

The length of the third edge of the garden plot is 1.3m.

Another example - the area of a piece of carpet

Here is another example to show how arithmetical calculations involving addition and multiplication are carried out using

the stack in RPN mode.

RPN mode is best for users going through calculations a step at a time, and sometimes even changing their minds

during the calculation.

Press ¹Þ1 then 2 to set FIX 2 mode, in which two digits will appear after the decimal point, as below.

This is especially useful when calculations are made with prices in dollars and cents.

RPN mode in detail

Now press the keys.

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This puts the 6 in the calculator, ENTER separates it from the next number

The number 6 is in X and in Y after ENTER is pressed

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Figure 2

Figure 3

HP 35s Using RPN Mode - Version 1.0