Question

Using the log table find the value of $1.234$.

Answer 1

$lo{g}_{10}1.234$

As number is already in the scientific form, look first two digits $\left(1.2\right)$ in first column in log table, then the entry corresponding to the $3^{rd}$ digit $\left(3\right)$ in the row of $1.2$, here we have the entry as $0.899$ add the mean difference corresponding to the forth digit $\left(4\right)$, Here, we have $14$, and add it to $0.899\Rightarrow 0.899+0.0014=0.0913$

$\Rightarrow lo{g}_{10}1.234=0.0913=0.0913$.