HP 10bII Manuel utilisateur

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HP 10BII Using Memories

Memories

The M Register

Numbered Registers

Storage Arithmetic

Practice using memories to solve problems

hp calculators

HP 10BII Using Memories

hp calculators - 2 - HP 10BII Using Memories - Version 1.0

Memories

The HP 10BII calculator has several storage areas called memories or registers that can be used to simplify solving

problems These memories hold a number for later use.

The M Register

The HP 10BII has a memory called the M register that is directly available from the basic keyboard. There are three keys

associated with the M register: RST.

The Rkey will store the number presently displayed into the M register. Note that this will overwrite any value

previously stored in the M register.

The Skey will recall the number presently in the M register to the display where it can be used.

The Tkey will add the number presently in the display to the number already in the M register. If pressed repeatedly,

it will add the number in the display to the number in the M register each time. This is often used to keep up with a

running total.

Numbered Registers

The HP 10BII also has 10 memories that are referenced by a number from 0 to 9. These memories are accessed using

two keys: Qand the yellow-shifted function Vq.

To store a number in the display into one of these memories, press Vqfollowed by a number from 0to 9.

Storing a number into a memory will overwrite the previous contents of the memory.

To recall a number from one of these memories to the display where it can be used, press Q followed by a number

from 0to 9.

Storage Arithmetic

The HP 10BII has the ability to perform arithmetic calculations on the values stored in the numbered memories. This is

done by pressing Vq, then one of the arithmetic keys, +-*/, and then a number between 0and 9.

For example, to multiply the contents of memory 8 by the number presently in the display, press Vq*8. The

examples will show ways this can be used.

Practice using memories to solve problems

Example 1: Solve

⎟

⎠

⎞

⎜

⎝

⎛

⎟

⎠

⎞

⎜

⎝

⎛⎟

⎠

⎞

⎜

⎝

⎛

⎟

⎠

⎞

⎜

⎝

⎛

Solution: Since this expression has two terms that are exactly the same, we can compute the value of the expression

the first time, save it in a memory and then recall the value for use later in the calculation. Note that the

hp calculators

HP 10BII Using Memories

hp calculators - 3 - HP 10BII Using Memories - Version 1.0

value of the expression is not computed and shown in the display until after the +key is pressed in the

steps shown below.

5+Us4/9Ut+RUs2/SUt=

Answer: 5.81. Note that the closing parentheses just before the =are not necessary. Pressing =will close all

open parentheses automatically.

Example 2: Find the sum of 90, 85, 70, 60 and 40 using the M register.

Solution: 90R85T70T60T40TS

Answer: 345. Note that while it would certainly be possible to find this answer by just adding the numbers together,

the process illustrated here is certainly much easier when the sum of several complicated individual

calculations is needed.

Example 3: Find the product of 90, 85, 70, 60 and 40 using the memory 4.

Solution: 90Vq485Vq*470Vq*460Vq*4

40Vq*4Q4

Answer: 1,285,200,000.

Example 4: Solve ( 2 + 3 ) ÷( 5 – 2 ) using the M register.

Solution: 5-2=R2+3/S=

Answer: 1.6. Note that this solution may be quicker than using parentheses.

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