$\log 100=2,\underline{\underline{\frac{\log 1}{100}=-2}},\log \sqrt{10}=\log {10}^{\frac{1}{2}}=\frac{1}{2}$ $\log 100=2,\underline{\underline{\frac{\log 1}{100}=-2}},\log \sqrt{10}=\log {10}^{\frac{1}{2}}=\frac{1}{2}$    

$\log 10=1,\underline{\underline{\frac{\log \sqrt{10}}{10}=\log {10}^{-\frac{1}{2}}=-\frac{1}{2}}},\log \sqrt{10000}=\log {10}^{\frac{4}{2}}=\frac{4}{2}=2$