Question: Adding decimals: thousandths
Problem
\[0.354 + 8.47 =\]
1. **State the problem:** We need to add the decimals $0.354$ and $8.47$.
2. **Align the decimals:** Write the numbers so the decimal points line up:
$$\begin{array}{r}
0.354 \\
+8.470 \\
\hline
\end{array}$$
Note that $8.47$ is written as $8.470$ to match the thousandths place.
3. **Add the numbers column by column starting from the right:**
- Thousandths place: $4 + 0 = 4$
- Hundredths place: $5 + 7 = 12$, write $2$ and carry $1$
- Tenths place: $3 + 4 = 7$, plus the carry $1$ gives $8$
- Units place: $0 + 8 = 8$
4. **Write the result:**
$$0.354 + 8.470 = 8.824$$
5. **Final answer:**
The sum of $0.354$ and $8.47$ is $8.824$.