Free printable math worksheet for practicing addition and subtraction of decimal numbers to the thousandths place.

I’ll solve each problem step by step, carefully aligning the decimal points and performing addition or subtraction as needed. Since there are many problems, I’ll go row by row, left column first, then right column.

---

Left Column:

1. 0.228 - 0.017
Align decimals:
```
0.228
- 0.017
-------
0.211
```

2. 3.583 + 8.552
```
3.583
+ 8.552
-------
12.135
```

3. 5.396 - 1.261
```
5.396
- 1.261
-------
4.135
```

4. 5.195 - 4.192
```
5.195
- 4.192
-------
1.003
```

5. 7.165 + 4.181
```
7.165
+ 4.181
-------
11.346
```

6. 4.696 - 0.232
```
4.696
- 0.232
-------
4.464
```

7. 5.547 - 0.048
```
5.547
- 0.048
-------
5.499
```

8. 5.385 + 5.451
```
5.385
+ 5.451
-------
10.836
```

9. 3.267 - 1.784
```
3.267
- 1.784
-------
1.483
```

10. 4.301 + 6.121
```
4.301
+ 6.121
-------
10.422
```

11. 7.685 + 8.508
```
7.685
+ 8.508
-------
16.193
```

12. 2.913 - 1.502
```
2.913
- 1.502
-------
1.411
```

13. 6.876 + 9.394
```
6.876
+ 9.394
-------
16.270 → or 16.27
```

14. 8.289 - 1.396
```
8.289
- 1.396
-------
6.893
```

15. 9.967 - 3.207
```
9.967
- 3.207
-------
6.760 → or 6.76
```

16. 7.593 + 4.711
```
7.593
+ 4.711
-------
12.304
```

---

Right Column:

1. 5.175 + 0.05
Write 0.05 as 0.050 to match thousandths:
```
5.175
+ 0.050
-------
5.225
```

2. 2.863 - 2.304
```
2.863
- 2.304
-------
0.559
```

3. 5.36 - 5.133
Write 5.36 as 5.360:
```
5.360
- 5.133
-------
0.227
```

4. 4.232 - 1.963
```
4.232
- 1.963
-------
2.269
```

5. 2.957 - 2.416
```
2.957
- 2.416
-------
0.541
```

6. 9.59 - 8.13
Write both as thousandths: 9.590 - 8.130
```
9.590
- 8.130
-------
1.460 → or 1.46
```

7. 0.943 - 0.832
```
0.943
- 0.832
-------
0.111
```

8. 8.798 - 1.36
Write 1.36 as 1.360:
```
8.798
- 1.360
-------
7.438
```

9. 0.637 + 0.824
```
0.637
+ 0.824
-------
1.461
```

10. 1.856 + 2.7
Write 2.7 as 2.700:
```
1.856
+ 2.700
-------
4.556
```

11. 3.465 + 6.601
```
3.465
+ 6.601
-------
10.066
```

12. 2.119 + 3.55
Write 3.55 as 3.550:
```
2.119
+ 3.550
-------
5.669
```

13. 6.701 - 5.483
```
6.701
- 5.483
-------
1.218
```

14. 4.242 - 2.164
```
4.242
- 2.164
-------
2.078
```

15. 8.436 - 4.519
```
8.436
- 4.519
-------
3.917
```

16. 7.041 + 7.389
```
7.041
+ 7.389
-------
14.430 → or 14.43
```

---

All calculations have been double-checked for accuracy.

Final Answer:
Left Column Answers (in order):
0.211, 12.135, 4.135, 1.003, 11.346, 4.464, 5.499, 10.836, 1.483, 10.422, 16.193, 1.411, 16.27, 6.893, 6.76, 12.304

Right Column Answers (in order):
5.225, 0.559, 0.227, 2.269, 0.541, 1.46, 0.111, 7.438, 1.461, 4.556, 10.066, 5.669, 1.218, 2.078, 3.917, 14.43