# I NEED TO DO LOG 10 CALCULATIONS THAT I HAVE NOT DOEN FOR YEARS AND DO NOT HAVE THE INSTRUCTIONS HADY. cAN YOU HELP ME WITH DRIVING THE 20S?

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• HP Master

Hello,
Enter the (positive) number , press [Left Shift: blue][LOG] to calculate log in base 10
12 [Left Shift][LOG] gives 1.079181246.
In general Functions in blue are accessed with left shift. functions in Yellow/Orange are accessed with RIGHT SHIFT.
As to the manual, there is not any around in the Web,except the Spanish version at hp Spain. This is one instance where it pays to speak in (foreign) tongues.
If you want the link, post to this thread and I will be happy to supply it.

Hope it gets you back in gear.

Posted on Oct 04, 2009

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Posted on Jan 02, 2017

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## Related Questions:

### How to take anti log in casio fx 991 ms and give example?

Depending on the actual log function you are talking about, the inverse function (what you call the anti log) can be one of several things.
The inverse of the natural log (LN) is the exponential function e^x.
If y= ln(x) then x=e^y
On a calculator functions that are inverse of one another share the same physical key. If one function is marked on a key, the inverse function is usually the SHIFTED (or 2nd) key
The inverse of the common (decimal logarithm) is the power function with 10 as base.
Example: if y= log(x) then x=10^y
For an arbitrary base (must be positive) if y= log_b(x) then x=b^y.
Note: I do not think that the FX-300ms can perform log calculations in bases other than e (natural log) or 10 (common decimal log).

Aug 13, 2011 | Casio FX-300MS Calculator

### How do i perform log and log inverse or antilog calculations on my sharp EL W-535 calculator

Press the log key, enter a poistive number and press the = key.
To calculate the inverse of the decimal log use SHIFT LOG to access the function 10^x (the inverse of the log function.)

Dec 15, 2010 | Sharp ELW535 Calculator

### Log3base27

The Casio FX-300MS cannot compute directly the logarithm in a base other than 10 or e (natural logs.) But do not despair: there is a way to do the calculations albeit indirectly. One has to use the relation: log in base a of number b =log_a(b)=log(b)/log(a) where log stands for log in base 10. You can also use a similar relation valid for natural logs log_a(b)=ln(b)/ln(a).

Aug 13, 2010 | Casio FX-300MS Calculator

### Negative log

Use the log function (common logarithm). See screen capture for markings on key.

To evaluate the negative of a logarithm
Enter the number (argument) of the logarithm
Press the = key to have it calculated.
While result is still displayed, press the sign change key or (+/-).

Beware that -log(number) is not necessarily a negative value.

Another way to calculate -log is to use the relation
log(1/a)=-log(a) .

3 [EXP] [(] [+/-] 2 [) ] [LOG][=] [+/-]

[EXP] is the key to enter exponent of a power of 10 :It is a shortcut, so no 10 is entered. Respect the key sequence above.
[ (] left parenthesis to prevent ambiguity due to the negaticve exponent. Just a security.
[)] is the enclosing right parenthesis
[+/-] is the Sign Change key

May 06, 2010 | Casio FX-260 Calculator

### Explain how to find the logarithm, base 18, of a number.

Hello,
Sorry I clicked the post a clarification request too fast.

You cannot compute it directly. You have to use the formula

log_18(number) = ln(number)/ln(18).

Alternatively, you can use

log_18(number) = log(number)/log(18)

If you use those types of calculations a lot, it might be a good idea to get a Casio FX-115ES, or a Casio FX-991 ES. They have other nice features like fraction calculations and radicals.

Hope it helps.

Oct 15, 2009 | Casio FX-300MS Calculator

### How do i use the inv log for calculations on my sharp el-531wh

Hello,

Let y=10^(x) 10 to the power of x
Take the log of both tems of the equality. You get
log(y)=log[10^(x)] where I used square brackets for clarity. But from the general properties of logarithms

log(b^(a)) = a*log(b)
Applied to our expression above
log(10^x)=x*log10
But since we are using log as log in base 10, log_10(10)=1
so
log(y)=x
We thus have two equivalent relations
y=10^x <----> x=log(y) The double arrow stands for equivalence.

If y is the log of x, then x is the antilog of y

Your question: With log_10 standing for logarith in base 10
pH=-log_10(c) c= concentration
Then log_10(c)=-pH the equivalence above translates as
log_10(c)=-pH is equivalent to c=10^(-pH)

The concentartion corresponding to a pH of 7.41 is
c=10^(-7.41)=3.89x10^(-8)

You enter it as follows
10[^]7.41[(-)][ENTER/=]

Hope it helps

Aug 09, 2009 | Sharp EL-531VB Calculator

### Cannot unlock the radio on my SAAB 9000 CDE

I have a Saab 900 -97 with a similar problem. I just solved it yesterday on my car. Hold the Band button in for like 10-15 sec when you see "Code In", It clears the error log in the radio. If it doen´t work, enter a wrong code so the code hangs on the display and then press the band button to clear the error log. It worked on my car, good luck!

/Tomas

May 19, 2009 | 1994 Saab 900

### I need to know how to do logs with a hp 20 scientific calculator

Hello,

12 [LN] gives 2.484906650 natural logarithm (ln) of 12
12 [LEFT SHIFT: blue] [LOG] gives 1.079181246 : common log of 12
Hope it helps

Mar 29, 2009 | HP 20s Calculator

### I'm trying to calculate base number equation

Hello,
You are victim of a confusion between terms. Base-n calculations are calculations using various numeration systems (bases) : binary (2), octal(8) hexadecimal (16) and decimal (10). What you want is how to calculate powers, logarithms, exponentials and these have also the notion of base; Log in base 10 is the common log, whereas natural logarithms, are logarithms in base e.
Back to your exemple: 5 times 5 and raise the whole to power 3?
In that case [(] 5 [x] 5 [)] [^] 3 or [X to the 3] if you have such key or
25 [^] 3, because 5x5 = 25

5 times (5 raised to power 3)
5[x] [( ] 5 [^] 3 [)] or 5 [^] 4 because of the rules about products of powers with the same base.

Hope it helps.

Feb 17, 2009 | Casio FX-115MS Plus Calculator

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