Use the form below to do your conversion.
Solution
Step1
Log217639=Log(7639) ÷ Log(21)
Log(7639)= 3.8830365100277
Log(21)=1.3222192947339
Log217639=3.8830365100277 ÷ 1.3222192947339
Ans=2.9367568038773
Step2
Alternatively, the logarithm can be calculated like this.