Question about Casio FX-300MS Calculator

# How to calculate logs in a calculator such as -100+88 ln80

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Hi,
There is nothing special for the natural logarithm: you use the [LN] key.
You press [LN] , enter the number, then hit [=].

Here you have a negative 100, you must use the change sign (-)
[(-)] 100 [+] 88[*] [LN] 80 [=] The result is 285.6183439

Hope it helps.
Thank you for rating this solution

Posted on Dec 10, 2009

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Posted on Jan 02, 2017

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## Related Questions:

1 Answer

### How do i change the base of a log

The calculator can only calculate logs to base e (ln) and ten (log).

However you can calculate the logarithm of x to any base b simply by calculating ln(x)/ln(b) or log(x)/log(b).

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The 30XIIS only calculates logs to base e (natural log, ln) and base 10 (common log, log). However logs to any base can be calculated indirectly.
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### How to get ans log of bases other then 10

You can calculate the log to any base B by dividing the base-10 log by the log-base-10 of the base B. You can also calculate it by dividing the natural log by the natural log of B.

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or
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### If i needed to enter log 5 to the base 3 into my calculator what buttons would i push?

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1 Answer

### How to calculate log base2

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1 Answer

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### How to calculate

It's very simple: the calculators have a default base 10 so that log x it's log x base 10 so here is some logs:
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### How to calculate log value in calculator with different base value

In any scientific calculator log2(n) can be  calculated with either ln or log function as follows

Log2(n)= ln(n) / ln(2)

Or
Log2(n)=log(n) / log(2)

both will give nearly the same answers

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