You can compute the following logarithms with your basic knowledge of powers.
For example, since $$2^3=8$$ we know that $$\log_2 8 = 3.$$


$\log_5 25 =$ .
$\log_6 36 =$ .
$\log_3 27 =$ .
$\log_{10} 10,000 =$ .
$\log_{10} 0.001 =$ .
$\log_{\pi} 1 =$ .

Hint: To get started observe that $5^2 = 25.$