Question: Add:
$10.5 - 2.2 = $
1. **State the problem:** We need to find the result of the subtraction $10.5 - 2.2$.
2. **Recall the subtraction rule:** When subtracting decimals, align the decimal points and subtract as with whole numbers.
3. **Align the numbers:**
$$\begin{array}{r}
10.5 \\
-2.2 \\
\hline
\end{array}$$
4. **Subtract the digits:**
Subtract $2.2$ from $10.5$ digit by digit:
- Tenths place: $5 - 2 = 3$
- Units place: $0 - 2$ requires borrowing from the tens place.
5. **Borrowing step:**
Borrow $1$ from the $1$ in the tens place, making it $0$, and add $10$ to the units place:
$$\cancel{1}0 - 2 = 8$$
6. **Final subtraction:**
$$10.5 - 2.2 = 8.3$$
7. **Answer:**
The result of $10.5 - 2.2$ is $8.3$.