Math Problem Solver

$$49.2 - 7.8=41.4=\frac{207}{5}$$

$$\begin{aligned} \mathtt{4}\overset{\mathtt{{\scriptscriptstyle 8}}}{\cancel{\mathtt{9}}}&\mathtt{.}\overset{{\scriptscriptstyle \mathtt{12}}}{\cancel{\mathtt{2}}}\\ \mathtt{-\phantom{0}}\phantom{0}\mathtt{7}&\mathtt{.}\mathtt{8}\\ \hline \mathtt{4}\mathtt{1}&\mathtt{.}\mathtt{4} \end{aligned}$$

Borrow $10^{0}$, resulting in $8$ in the $10^{0}$ place, and $12$ in the $10^{-1}$ place.

$4$ is the digit in the $10^{-1}$ place. $12 \times 10^{-1} - 8 \times 10^{-1} = 4 \times 10^{-1}$.

$1$ is the digit in the $10^{0}$ place. $8 \times 10^{0} - 7 \times 10^{0} = 1 \times 10^{0}$.

$4$ is the digit in the $10^{1}$ place. $4 \times 10^{1} - 0 \times 10^{1} = 4 \times 10^{1}$.