HP 35s Instruction Manual page 3

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HP 35s Using Calculator Memories to Help Solve Problems
To calculate the mass, multiply the length by the width by the height. Then recall the number from D and
multiply by that. In RPN mode, press the keys:
In algebraic mode, press:
Answer: The beam has a mass of 8,988 pounds. This value of the variable D can be used for further calculations. If
a different type of concrete is selected, the density of this new type can be stored in D and the calculations
can be repeated. The value in D is not lost when the calculator is turned off.
Note: The recall and the multiplication can be combined into one command RCL×D. A separate training aid describes
using arithmetic with the memory registers.
Practice Example: Storing a Temporary Result
The memory registers are available separately from the memory in which ordinary calculations are carried out. In
algebraic mode, up to thirteen levels of brackets can be used, together with numbers saved with the brackets. RPN
mode has four stack registers, X, Y, Z and T, and also the LastX register, often called L. The memory registers are
separate from these. Note that the variables named L, T, X, Y and Z are not the same as the stack registers with these
names, and that the Exponent key
If a calculation is more complicated than the algebraic or RPN rules allow, temporary results can be stored in memory
registers, and can then be used later.
Temporary results can also be stored in memory registers just to make a calculation easier, as in this example.
Example 2: The formula below uses the expression (0.2 + sin(35°)) three times. In algebraic mode, it would be difficult
to re-use this expression without typing it in each time. In RPN mode the expression could be calculated
once, then kept on the stack and re-used as needed, but this would require keeping track of which number
is where on the stack.
Solution: The expression uses degrees, so set Degrees mode if it is not already set. (To do this press 9
First calculate the expression that is used several times and store its value in a memory register. In this
example, use register V for the value of the expression. Then calculate the whole formula, recalling the
value each time it is needed.
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and the Cancel key
- 3 -
Figure 1
do not access the variables with these names.
HP 35s Using Calculator memories to Help Solve Problems - Version 1.0
Figure 2
.)