Math Problem Solver

$$10 + 900=910$$

$$\begin{aligned} \phantom{0}\mathtt{1}\mathtt{0}\\ \mathtt{+\phantom{0}}\mathtt{9}\mathtt{0}\mathtt{0}\\ \hline \mathtt{9}\mathtt{1}\mathtt{0} \end{aligned}$$

$0$ is the digit in the $10^{0}$ place. $0 \times 10^{0} + 0 \times 10^{0} = 0 \times 10^{0}$.

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

$9$ is the digit in the $10^{2}$ place. $0 \times 10^{2} + 9 \times 10^{2} = 9 \times 10^{2}$.