Use the form below to do your conversion.
Solution
Step1
Log219905=Log(9905) ÷ Log(21)
Log(9905)= 3.9958544798746
Log(21)=1.3222192947339
Log219905=3.9958544798746 ÷ 1.3222192947339
Ans=3.0220815078021
Step2
Alternatively, the logarithm can be calculated like this.