10 Logarithms on your calculator
Logarithms to base 10 of numbers can be found using the key. For example, can be calculated using the key sequence . Note that as with the trigonometric functions, the key automatically opens a bracket that must be closed if you are using the calculated logarithm as part of a longer calculation.
The second function of the key , accessed using , can be used as an alternative to when calculating powers of 10.
Activity 19 Calculating logarithms
Use your calculator to find the values of the following.
, , (1 billion) ,
All the calculations are logarithms to base 10, so we use the key.
, , (1 billion) , .