Grade 5 Addition Worksheets | Free Printables | Math Worksheets - Free Printable

Let's solve each of the decimal addition problems step by step. We'll line up the decimals properly and add them carefully.

---

Left Column:

1. 45.3 + 9.9 = ?
Align decimals:
```
45.3
+ 9.9
------
55.2
```
✔ Answer: 55.2

2. 6.7 + 39.7 = ?
```
6.7
+39.7
------
46.4
```
✔ Answer: 46.4

3. 16.8 + 17.5 = ?
```
16.8
+17.5
------
34.3
```
✔ Answer: 34.3

4. 9.2 + 8.8 = ?
```
9.2
+ 8.8
------
18.0
```
✔ Answer: 18.0 (or just 18)

5. 16.3 + 18.8 = ?
```
16.3
+18.8
------
35.1
```
✔ Answer: 35.1

6. 2.53 + 4.5 = ?
Convert 4.5 to 4.50 for alignment:
```
2.53
+ 4.50
-------
7.03
```
✔ Answer: 7.03

7. 95.6 + 8.64 = ?
Convert 95.6 to 95.60:
```
95.60
+ 8.64
-------
104.24
```
✔ Answer: 104.24

8. 17.7 + 22.3 = ?
```
17.7
+22.3
------
40.0
```
✔ Answer: 40.0 (or 40)

9. 8.95 + 9.2 = ?
Convert 9.2 to 9.20:
```
8.95
+ 9.20
-------
18.15
```
✔ Answer: 18.15

10. 6.3 + 7.55 = ?
Convert 6.3 to 6.30:
```
6.30
+ 7.55
-------
13.85
```
✔ Answer: 13.85

---

Right Column:

1. 9.63 + 2.88 = ?
```
9.63
+ 2.88
-------
12.51
```
✔ Answer: 12.51

2. 5.74 + 9.9 = ?
Convert 9.9 to 9.90:
```
5.74
+ 9.90
-------
15.64
```
✔ Answer: 15.64

3. 4.12 + 6.31 = ?
```
4.12
+ 6.31
-------
10.43
```
✔ Answer: 10.43

4. 92.3 + 9.32 = ?
Convert 92.3 to 92.30:
```
92.30
+ 9.32
-------
101.62
```
✔ Answer: 101.62

5. 74.3 + 83.5 = ?
```
74.3
+83.5
------
157.8
```
✔ Answer: 157.8

6. 4.21 + 9.6 = ?
Convert 9.6 to 9.60:
```
4.21
+ 9.60
-------
13.81
```
✔ Answer: 13.81

7. 47.3 + 52.9 = ?
```
47.3
+52.9
------
100.2
```
✔ Answer: 100.2

8. 45.4 + 8.6 = ?
```
45.4
+ 8.6
------
54.0
```
✔ Answer: 54.0 (or 54)

9. 36.2 + 4.78 = ?
Convert 36.2 to 36.20:
```
36.20
+ 4.78
-------
40.98
```
✔ Answer: 40.98

10. 6.63 + 82.1 = ?
Convert 82.1 to 82.10:
```
6.63
+82.10
-------
88.73
```
✔ Answer: 88.73

---

✔ Final Answers:

#### Left Column:
1. 55.2
2. 46.4
3. 34.3
4. 18.0
5. 35.1
6. 7.03
7. 104.24
8. 40.0
9. 18.15
10. 13.85

#### Right Column:
1. 12.51
2. 15.64
3. 10.43
4. 101.62
5. 157.8
6. 13.81
7. 100.2
8. 54.0
9. 40.98
10. 88.73

---

✔ Tip: Always align the decimal points before adding, and add zeros if needed to make the number of decimal places equal. This helps avoid mistakes!

Let me know if you'd like this as a printable answer key!