Question about Texas Instruments TI-30XA Calculator

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Hello,

To calculate the natural log of a number use [LN] key. You enter it as

number [LN] [=] exemple **15.32 [LN] [=] **gives 2.729150164

To clculate the log base 10 (common logarithm) you use the [LOG] key**15.32 [LOG][=]** gives 1.185258765.

Hope it helps

Posted on Sep 17, 2009

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2helpful

2answers

To take the log of a number, enter the number then press the LOG button, then the =. To take the log of a negative number, enter the negative number using the +/- key just to the right of the decimal point. To calculate the negative of a log, calculate the log and then negate it using +/-. To calculate the antilog (inverse logarithm), press 2nd then LOG.

Bear in mind that LOG is the common (base-10) logarithm. For the natural (base-e) logarithm, use the LN key to its right.

Bear in mind that LOG is the common (base-10) logarithm. For the natural (base-e) logarithm, use the LN key to its right.

Nov 07, 2011 •
Texas Instruments TI-30XA Calculator

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1answer

To calculate the common log ( LOG base 10) of a positive number, just press the LOG key, the one above the blue Division key, then enter the number and close the right parenthesis. Press the ENTER key to get the result.

If you want to calculate the log in a base other than e (natural) or 10 (decimal) logarithms, you need to make use of one of the equivalent formulas below

log in base a of a number b

log_a(b)=log_10(b) / [ log_10(a)] or

log_a(b)= ln(b)/ln(a)

If you want to calculate the log in a base other than e (natural) or 10 (decimal) logarithms, you need to make use of one of the equivalent formulas below

log in base a of a number b

log_a(b)=log_10(b) / [ log_10(a)] or

log_a(b)= ln(b)/ln(a)

Apr 19, 2011 •
HP 39g Calculator

6helpful

1answer

First of all, to compute the log of a number, enter the number first then press the LOG key.

Second, to compute the log to a base b other than e or 10, use the relationship

logb(x) = log(x) / log(b) = ln(x) / ln(b)

You can use either the common log (log) or the natural log (ln), as long as you're consistent.

So, to calculate log2(2.5), press

2 . 5 log / 2 log =

or

2 . 5 ln / 2 ln =

Second, to compute the log to a base b other than e or 10, use the relationship

logb(x) = log(x) / log(b) = ln(x) / ln(b)

You can use either the common log (log) or the natural log (ln), as long as you're consistent.

So, to calculate log2(2.5), press

2 . 5 log / 2 log =

or

2 . 5 ln / 2 ln =

Feb 04, 2011 •
Texas Instruments TI-30 Xa Solar...

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1answer

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.)

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

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1answer

You can't. However, you can calculate the log base 2 of any number by calculating

log2(x) = log(x)/log(2) = ln(x)/ln(2)

That is, the log base 2 of any number is the log of that number divided by the log of 2.

log2(x) = log(x)/log(2) = ln(x)/ln(2)

That is, the log base 2 of any number is the log of that number divided by the log of 2.

Dec 15, 2010 •
Casio FX350MS Scientific Calculator

1helpful

1answer

Use the LOG key on the top row for common logs, the LN key for natural logs. In either case, simply enter the number as given then press the appropriate log key, then press =.

Oct 29, 2010 •
Texas Instruments TI-30XA Calculator

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2answers

Please use the following link to download the manual for your calculator.

http://www.devicemanuals.com/guide/Calculator/HP/HP-20s-Scientific-Calculator-Owner's-Manual-==TVRFME5UWTE=.html

http://www.devicemanuals.com/guide/Calculator/HP/HP-20s-Scientific-Calculator-Owner's-Manual-==TVRFME5UWTE=.html

Aug 28, 2010 •
HP 20s Calculator

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1answer

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) .

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) .

Jun 01, 2010 •
Casio FX-260 Calculator

4helpful

2answers

Hi,

**Logarithms in base 10 :Common logarithms**

**Logarithms in base e : Natural logarithms**

Don't forget to rate the solution and don't be stingy: 4 thumbs up won't leave you any the poorer.

- The calculator has a key labeled [LOG]. It allows you to calculate the common logarithms (logarithms in base 10).
- To calculate the common logarithm of a (positive) number you type in the number, press the [LOG] key .
- Ex: 15.32 [LOG][=] gives 1.1852558765

- The calculator has a key labeled [LN]. It allows you to calculate the natural logarithms of positive numbers.
- Ex: natural log of 15.32 is entered as
- 15.32 [LN] gives 2.729159164

Don't forget to rate the solution and don't be stingy: 4 thumbs up won't leave you any the poorer.

Nov 23, 2009 •
Texas Instruments TI-36 X Solar Calculator

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1answer

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).

Here log_18 is log in base 18, ln is the natural logarithm (naeperian or log in base e).

Alternatively, you can use

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

where log is log in base 10.

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.

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).

Here log_18 is log in base 18, ln is the natural logarithm (naeperian or log in base e).

Alternatively, you can use

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

where log is log in base 10.

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

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