Printable worksheet for practicing addition and subtraction of decimal numbers, featuring 12 problems with varying decimal places.

Problem: Adding & Subtracting Decimals Worksheet

We are tasked with solving each problem involving addition and subtraction of decimals. Let's solve each problem step by step.

---

#### Problem 1:
$$
90.6 - 28.3
$$
- Align the decimal points:
$$
\begin{array}{r}
90.6 \\
- 28.3 \\
\hline
\end{array}
$$
- Subtract digit by digit:
- In the tenths place: \(6 - 3 = 3\)
- In the ones place: \(0 - 8\) (borrow 1 from the tens place, making it \(10 - 8 = 2\))
- In the tens place: \(8 - 2 = 6\)
- Result:
$$
90.6 - 28.3 = 62.3
$$

#### Problem 2:
$$
93.3 + 29.2
$$
- Align the decimal points:
$$
\begin{array}{r}
93.3 \\
+ 29.2 \\
\hline
\end{array}
$$
- Add digit by digit:
- In the tenths place: \(3 + 2 = 5\)
- In the ones place: \(3 + 9 = 12\) (write down 2 and carry over 1)
- In the tens place: \(9 + 2 + 1 = 12\)
- Result:
$$
93.3 + 29.2 = 122.5
$$

#### Problem 3:
$$
72.3 - 12.9
$$
- Align the decimal points:
$$
\begin{array}{r}
72.3 \\
- 12.9 \\
\hline
\end{array}
$$
- Subtract digit by digit:
- In the tenths place: \(3 - 9\) (borrow 1 from the ones place, making it \(13 - 9 = 4\))
- In the ones place: \(1 - 2\) (borrow 1 from the tens place, making it \(11 - 2 = 9\))
- In the tens place: \(6 - 1 = 6\)
- Result:
$$
72.3 - 12.9 = 59.4
$$

#### Problem 4:
$$
63.44 - 59.688
$$
- Align the decimal points:
$$
\begin{array}{r}
63.440 \\
- 59.688 \\
\hline
\end{array}
$$
- Subtract digit by digit:
- In the thousandths place: \(0 - 8\) (borrow 1 from the hundredths place, making it \(10 - 8 = 2\))
- In the hundredths place: \(3 - 8\) (borrow 1 from the tenths place, making it \(13 - 8 = 5\))
- In the tenths place: \(3 - 6\) (borrow 1 from the ones place, making it \(13 - 6 = 7\))
- In the ones place: \(2 - 9\) (borrow 1 from the tens place, making it \(12 - 9 = 3\))
- In the tens place: \(5 - 5 = 0\)
- Result:
$$
63.44 - 59.688 = 3.752
$$

#### Problem 5:
$$
90.0 + 83.3
$$
- Align the decimal points:
$$
\begin{array}{r}
90.0 \\
+ 83.3 \\
\hline
\end{array}
$$
- Add digit by digit:
- In the tenths place: \(0 + 3 = 3\)
- In the ones place: \(0 + 3 = 3\)
- In the tens place: \(9 + 8 = 17\)
- Result:
$$
90.0 + 83.3 = 173.3
$$

#### Problem 6:
$$
54.3 + 18.8
$$
- Align the decimal points:
$$
\begin{array}{r}
54.3 \\
+ 18.8 \\
\hline
\end{array}
$$
- Add digit by digit:
- In the tenths place: \(3 + 8 = 11\) (write down 1 and carry over 1)
- In the ones place: \(4 + 8 + 1 = 13\) (write down 3 and carry over 1)
- In the tens place: \(5 + 1 + 1 = 7\)
- Result:
$$
54.3 + 18.8 = 73.1
$$

#### Problem 7:
$$
99.3 - 88.1
$$
- Align the decimal points:
$$
\begin{array}{r}
99.3 \\
- 88.1 \\
\hline
\end{array}
$$
- Subtract digit by digit:
- In the tenths place: \(3 - 1 = 2\)
- In the ones place: \(9 - 8 = 1\)
- In the tens place: \(9 - 8 = 1\)
- Result:
$$
99.3 - 88.1 = 11.2
$$

#### Problem 8:
$$
5.37 + 2.84
$$
- Align the decimal points:
$$
\begin{array}{r}
5.37 \\
+ 2.84 \\
\hline
\end{array}
$$
- Add digit by digit:
- In the hundredths place: \(7 + 4 = 11\) (write down 1 and carry over 1)
- In the tenths place: \(3 + 8 + 1 = 12\) (write down 2 and carry over 1)
- In the ones place: \(5 + 2 + 1 = 8\)
- Result:
$$
5.37 + 2.84 = 8.21
$$

#### Problem 9:
$$
0.52 + 8.33
$$
- Align the decimal points:
$$
\begin{array}{r}
0.52 \\
+ 8.33 \\
\hline
\end{array}
$$
- Add digit by digit:
- In the hundredths place: \(2 + 3 = 5\)
- In the tenths place: \(5 + 3 = 8\)
- In the ones place: \(0 + 8 = 8\)
- Result:
$$
0.52 + 8.33 = 8.85
$$

#### Problem 10:
$$
3.76 - 1.91
$$
- Align the decimal points:
$$
\begin{array}{r}
3.76 \\
- 1.91 \\
\hline
\end{array}
$$
- Subtract digit by digit:
- In the hundredths place: \(6 - 1 = 5\)
- In the tenths place: \(7 - 9\) (borrow 1 from the ones place, making it \(17 - 9 = 8\))
- In the ones place: \(2 - 1 = 1\)
- Result:
$$
3.76 - 1.91 = 1.85
$$

#### Problem 11:
$$
2.00 - 0.17
$$
- Align the decimal points:
$$
\begin{array}{r}
2.00 \\
- 0.17 \\
\hline
\end{array}
$$
- Subtract digit by digit:
- In the hundredths place: \(0 - 7\) (borrow 1 from the tenths place, making it \(10 - 7 = 3\))
- In the tenths place: \(9 - 1 = 8\) (after borrowing)
- In the ones place: \(1 - 0 = 1\)
- Result:
$$
2.00 - 0.17 = 1.83
$$

#### Problem 12:
$$
5.24 + 3.32
$$
- Align the decimal points:
$$
\begin{array}{r}
5.24 \\
+ 3.32 \\
\hline
\end{array}
$$
- Add digit by digit:
- In the hundredths place: \(4 + 2 = 6\)
- In the tenths place: \(2 + 3 = 5\)
- In the ones place: \(5 + 3 = 8\)
- Result:
$$
5.24 + 3.32 = 8.56
$$

---

Final Answers:

$$
\boxed{
\begin{array}{ll}
1. & 62.3 \\
2. & 122.5 \\
3. & 59.4 \\
4. & 3.752 \\
5. & 173.3 \\
6. & 73.1 \\
7. & 11.2 \\
8. & 8.21 \\
9. & 8.85 \\
10. & 1.85 \\
11. & 1.83 \\
12. & 8.56 \\
\end{array}
}
$$