HP 10S Handbuch

hp calculators

HP 10s Memory Calculations

The Memory Keys

Practice Using the Memory to Solve Problems

hp calculators

HP 10s Memory Calculations

hp calculators - 2 - HP 10s Memory Calculations - Version 1.0

The memory keys

The HP 10s provides a special register, the memory (M), in which a number can be stored. If this number is different

than zero then the M annunciator is lit. The contents of the memory can be recalled and be used in any calculation

except in Statistics mode. The memory will save you having to write down results, and also many keystrokes when

performing chain calculations, repetitive evaluations, etc. On the HP 10s the memory keys are called as follows:

♦The Store key: Av| stores the displayed number in memory. The previous contents of the memory is lost,

and the number in the display is not altered. No pending calculation is affected.

♦The Recall key: U| recalls the contents of the memory. The memory is not altered and pending calculations are

not cancelled.

♦The Sum key: Zadds the displayed number to the contents of the memory. It does an implicit EQUALS first: the

calculation in progress is performed and the result is displayed and added to the memory.

To clear the memory (that is, to turn off the M annunciator) simply store 0 in it by pressing 0Av|.

Practice using the memory to solve problems

Example 1: Calculate

896987675712461 !+++!+..

using the Zkey.

Solution: First of all, clear the memory: 0Av|. We can add all these numbers as follows:

1.46Z12ZO7.5Z67Z987Z6ZO89Z

Press U| to display the answer.

Answer: 976.96

You may find it more convenient to use the usual way, that is: 1.46+12-… -89=

which is actually shorter, but consider this:

Example 2: Calculate the following operations, and find the sum of the first, second and fourth results:

35 "ln5, #2"85, 34

3and 31

13#3.5

Solution: The Zkey allows us to select the numbers to be added. Clear the memory (0Av|) and press:

35*N5= Z

O2*8L5= Z

Ag34=

31/13LO3.5= Z

Press U|to display the sum.

Answers: Rounded to two decimal places, the results are 56.33, –65536, 3.24 and 245563.28, respectively. The sum

requested is 180083.61

hp calculators

HP 10s Memory Calculations

hp calculators - 3 - HP 10s Memory Calculations - Version 1.0

Example 3: Calculate

3.1267 +342

( )

"3.1267

3.1267 +ln 3.1267

Solution: Since 3.1267 appears four times in this expression, we will store it in memory:

3.1267Av|

which will save us quite a few keystrokes:

U|+34J=LOU|

/WU|+NIU|=

Answer: 7.105079822·10–11

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