Logarithms in base 10 (common logarithm) and e (natural logarithm) can be calculated directly using the keyboard. But if someone wants to calculate a logarithm in any other base, he has to convert this logarithm to a logarithm in base 10 using the following equation:
logXY = log Y / log X
(logXY is the log of Y in base X and log Y is the log of Y in base 10. )
The correctness or validity of this equation can be verified simply. In this way then it is possible to calculate the logarithm of a number to any base with Casio’s scientific/graphical calculators .
Note: With a graphic calculator such logarithms can also be drawn.
At the following model, you can specify base X using the syntax”log(X,Y)”.
The models:
ClassPad Series
At the following model, you can specify base a using the syntax”logab”.
The models:
fx-9860GIII Series, fx-CG Series
