Printable worksheet for practicing adding decimal numbers, including 20 problems and a space for name and score.

To solve the problem of adding decimal numbers, we will go through each addition step by step. Here is the solution for each problem:

Problem 1: \( 2.4 + 17.54 \)

- Align the decimals:
```
2.40
+17.54
------
19.94
```
- Answer: \( 19.94 \)

Problem 2: \( 6.2 + 3.55 \)

- Align the decimals:
```
6.20
+3.55
------
9.75
```
- Answer: \( 9.75 \)

Problem 3: \( 2.2 + 17.8 \)

- Align the decimals:
```
2.2
+17.8
------
20.0
```
- Answer: \( 20.0 \)

Problem 4: \( 1.8 + 12.99 \)

- Align the decimals:
```
1.80
+12.99
------
14.79
```
- Answer: \( 14.79 \)

Problem 5: \( 3.5 + 16.5 \)

- Align the decimals:
```
3.5
+16.5
------
20.0
```
- Answer: \( 20.0 \)

Problem 6: \( 2.5 + 15.44 \)

- Align the decimals:
```
2.50
+15.44
------
17.94
```
- Answer: \( 17.94 \)

Problem 7: \( 5.1 + 12.89 \)

- Align the decimals:
```
5.10
+12.89
------
17.99
```
- Answer: \( 17.99 \)

Problem 8: \( 3.3 + 12.6 \)

- Align the decimals:
```
3.3
+12.6
------
15.9
```
- Answer: \( 15.9 \)

Problem 9: \( 6 + 15.78 \)

- Align the decimals:
```
6.00
+15.78
------
21.78
```
- Answer: \( 21.78 \)

Problem 10: \( 1.9 + 12.05 \)

- Align the decimals:
```
1.90
+12.05
------
13.95
```
- Answer: \( 13.95 \)

Problem 11: \( 3.9 + 10.01 \)

- Align the decimals:
```
3.90
+10.01
------
13.91
```
- Answer: \( 13.91 \)

Problem 12: \( 2.2 + 17.06 \)

- Align the decimals:
```
2.20
+17.06
------
19.26
```
- Answer: \( 19.26 \)

Problem 13: \( 9 + 64.99 \)

- Align the decimals:
```
9.00
+64.99
------
73.99
```
- Answer: \( 73.99 \)

Problem 14: \( 7.5 + 12.59 \)

- Align the decimals:
```
7.50
+12.59
------
20.09
```
- Answer: \( 20.09 \)

Problem 15: \( 4.1 + 15.55 \)

- Align the decimals:
```
4.10
+15.55
------
19.65
```
- Answer: \( 19.65 \)

Problem 16: \( 8.5 + 15.05 \)

- Align the decimals:
```
8.50
+15.05
------
23.55
```
- Answer: \( 23.55 \)

Problem 17: \( 9.1 + 22.22 \)

- Align the decimals:
```
9.10
+22.22
------
31.32
```
- Answer: \( 31.32 \)

Problem 18: \( 3.5 + 16.65 \)

- Align the decimals:
```
3.50
+16.65
------
20.15
```
- Answer: \( 20.15 \)

Problem 19: \( 1.4 + 15.99 \)

- Align the decimals:
```
1.40
+15.99
------
17.39
```
- Answer: \( 17.39 \)

Problem 20: \( 5.5 + 49.2 \)

- Align the decimals:
```
5.5
+49.2
------
54.7
```
- Answer: \( 54.7 \)

Problem 21: \( 2.8 + 19.08 \)

- Align the decimals:
```
2.80
+19.08
------
21.88
```
- Answer: \( 21.88 \)

Problem 22: \( 5.1 + 16.05 \)

- Align the decimals:
```
5.10
+16.05
------
21.15
```
- Answer: \( 21.15 \)

Problem 23: \( 0.5 + 0.58 \)

- Align the decimals:
```
0.50
+0.58
------
1.08
```
- Answer: \( 1.08 \)

Problem 24: \( 0.1 + 19.51 \)

- Align the decimals:
```
0.10
+19.51
------
19.61
```
- Answer: \( 19.61 \)

Problem 25: \( 9.4 + 18.55 \)

- Align the decimals:
```
9.40
+18.55
------
27.95
```
- Answer: \( 27.95 \)

Final Answer:

\[
\boxed{
\begin{array}{ccc}
19.94 & 9.75 & \\
20.0 & 14.79 & \\
20.0 & 17.94 & 17.99 \\
15.9 & 21.78 & 13.95 \\
13.91 & 19.26 & 73.99 \\
20.09 & 19.65 & 23.55 \\
31.32 & 20.15 & 17.39 \\
54.7 & 21.88 & 21.15 \\
1.08 & 19.61 & 27.95 \\
\end{array}
}
\]