Remember that the log on your simple calculator is actually log10 so using change of base formula for how to use the change of base formula rewrite a logarithm ion use the change of base formula and a calculator . Also, you may want to be able to calculate natural logarithms without calculator. I will tell you a method that I use: since $\exp 3 \approx 20$, you can take $\log 20 \approx 3$. Hence, to calculate $\log n$ in practical applications, first calculate $\log_{20} n$, then multiply it by $3$. Since $20$ is an integer, it is easier to work with it. Change of Base Formula A formula that allows you to rewrite a logarithm in terms of logs written with another base. This is especially helpful when using a calculator to evaluate a log to any base .

# Logarithm change of base without calculator

How to Solve Logarithms by Using the Change of Base Formula : Logarithms, Lesson 4, time: 5:05

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