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Common logarithm

On a Casio calculator you can calculate logarithms of base 10 with the key

log

 


Example 1

To calculate log (1) = 0

log  1  =  log 1
           0.

because 100 = 1.

 


Example 2

To calculate log (1000) = 3

log  1   0   0   0  =  log 1000
           3.

because 103 = 1000.

 


Example 3

To calculate log (27.83) = 1.4445…

log  2   7   ·   8   3  =  log 27.83
 1.444513206 

because 101.4444513206 = 27.83.

 


Example 4

To calculate log (0.1) = −1

log  0   ·   1  =  log 0.1
          -1.

 


Example 5

To calculate log3 (9) = 2

log  9  ÷ log  3  =  log 9÷log 3
           2.

 


Details

The functions log and 10x are on the same key. That is so because these functions have to do with the number 10.

 


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