Use the form below to do your conversion.
Solution
Step1
Log109991=Log(9991) ÷ Log(10)
Log(9991)= 3.9996089589714
Log(10)=1
Log109991=3.9996089589714 ÷ 1
Ans=3.9996089589714
Step2
Alternatively, the logarithm can be calculated like this.