# Why use logs?

What is the purpose of using logs in stead of plain calculations?

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Some calculations are simpler and easier using logarithms. They also appear in nature. See https://en.wikipedia.org/wiki/Logarithm

Posted on Dec 30, 2016

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## Related Questions:

### C=4*1000/41.4 log base 10(1.8/1) nano farad how to slove C

There is nothing to solve. Just calculate it on a scientific calculator that has log key.
From the screen below, choose your case as your statement is ambiguous (to me). Question: What is the purpose of carrying the 1 in the denominator of the argument of the logarithm function?
Always simplify as much as possible.

Apr 09, 2015 | Office Equipment & Supplies

### How to use tan^2(55)

It's a quirk of notation. When a book says tan^2(x), it actually means (tan(x))^2. Only the trigonometric and hyperbolic functions seem to get written this way. If one wants the square of a logarithm, for example, one doesn't write log^2(x).

The short answer: if you want tan^2(55), calculate tan(55) then square it.

Oct 15, 2014 | Casio Office Equipment & Supplies

### My casio fx-82ms does not work when i use the 100% option ... example if i do 0.25 / 100% i would not give me the correct answer in stead of 25 it gives me o.25 .

100% is the same thing as 1, so .25 / 100% is the same as .25 / 1, which is 0.25 as the calculator shows. Why do you think it should be 25 and not 0.25?

Sep 28, 2013 | Casio FX82MS Scientific Calculator

### How do i give the value of log

For common log, use the LOG key. For natural log, use the LN key. In either case, enter (or calculate) the value of the argument and then press the appropriate key.

To calculate the common log of 2, press 2 LOG =

To calculate the natural log of 2, press 2 LN =

Sep 08, 2011 | Texas Instruments TI-30XA Calculator

### Where do I find the Log function on the EL 733A calculator

Log mentioned above is base 10. Hope this helps.
P.S. I posted an image, got a post error if typed on plain text, fixya won't accept.

Mar 02, 2011 | Sharp EL-733A Calculator

### Conversion of log base 10 to log base 2

To calculate the log base 2 of a value, calculate its log and then divide by the log of 2. You can use either the log or the ln keys, but be consistent. For example, to calculate the log base 2 of 16, you can calculate either log(16)/log(2) or ln(16)/ln(2).

Nov 27, 2010 | Casio FX570MS Scientific Calculator

### How to calculate log base2

You can calculate logs to any base by using the relationship
log-base-b(x) = log(x) / log(b) = ln(x) / ln(b)

So, to calculate the log base 2 of 32, for example, calculate log(32) and divide by log(2).

Nov 18, 2010 | Casio FX-300MS Calculator

### How do i do log base x problems (other than log base 10) on the datexx ds 883?

Calculate it the same way as on most other calculators, using the relation

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

In words, calculate the log base 10 of x divided by the log base 10 of the base. You can also use the natural log function instead of the common (base 10) log--just be consistent.

Oct 19, 2010 | DateXX DS-883 Calculator

### How do I find the log button or how do I use the calculator to calculate a log problem? i.e. (log (learning curve))/(log(2))

The natural log is the LN key, located just to the left of the 7 key.

To calculate the common log, use the relationship log(x) = ln(x)/ln(10).

To calculate the natural log of 3, press 3 LN

To calculate the common log of 3, press 3 LN / 1 0 LN =

Aug 09, 2010 | Texas Instruments BA-II Plus Calculator

### How to perform log and - log function

To use the log function you press the [LOG] key in the middle of the first row of keys.
To use it.
Enter the number the log of which you want to calculate (must be positive)
Press the [LOG] key
Result is displayed.

Ex log(33.54)
33.54 [LOG] result is 1.5255

Once a logarithm has been calculated, use the [+/-] key, the change sign key located between the [.] and the [=] keys, on the bottom row of keys. You must press the change sign after you have calculated the logarithm.

Mar 01, 2010 | Texas Instruments TI-30XA Calculator

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