Let's solve each of these decimal addition and subtraction problems step by step. We'll align the decimals properly and perform the operations carefully.
---
Problem 1:
3.897 + 1.127
```
3.897
+ 1.127
-------
5.024
```
✔ Answer: 5.024
---
Problem 2:
9.387 - 1.819
```
9.387
- 1.819
-------
7.568
```
✔ Answer: 7.568
---
Problem 3:
1.944 - 1.174
```
1.944
- 1.174
-------
0.770
```
✔ Answer: 0.770 (or
0.77, but keep three decimal places →
0.770)
---
Problem 4:
5.234 + 4.199
```
5.234
+ 4.199
-------
9.433
```
✔ Answer: 9.433
---
Problem 5:
3.092 - 1.308
```
3.092
- 1.308
-------
1.784
```
✔ Answer: 1.784
---
Problem 6:
4.448 - 3.432
```
4.448
- 3.432
-------
1.016
```
✔ Answer: 1.016
---
Problem 7:
9.423 + 3.231
```
9.423
+ 3.231
-------
12.654
```
✔ Answer: 12.654
---
Problem 8:
4.982 - 2.999
```
4.982
- 2.999
-------
1.983
```
✔ Answer: 1.983
---
Problem 9:
7.224 + 6.331
```
7.224
+ 6.331
-------
13.555
```
✔ Answer: 13.555
---
Problem 10:
6.104 - 5.503
```
6.104
- 5.503
-------
0.601
```
✔ Answer: 0.601
---
Problem 11:
5.204 + 5.199
```
5.204
+ 5.199
-------
10.403
```
✔ Answer: 10.403
---
Problem 12:
6.290 + 8.980
```
6.290
+ 8.980
-------
15.270
```
✔ Answer: 15.270 (can be written as
15.27, but keep to thousandths →
15.270)
---
Problem 13:
0.987 + 3.442
```
0.987
+ 3.442
-------
4.429
```
✔ Answer: 4.429
---
Problem 14:
7.434 + 6.177
```
7.434
+ 6.177
-------
13.611
```
✔ Answer: 13.611
---
Problem 15:
3.997 - 2.813
```
3.997
- 2.813
-------
1.184
```
✔ Answer: 1.184
---
Problem 16:
3.143 - 0.198
```
3.143
- 0.198
-------
2.945
```
✔ Answer: 2.945
---
✔ Final Answers:
| Problem | Answer |
|--------|------------|
| ① | 5.024 |
| ② | 7.568 |
| ③ | 0.770 |
| ④ | 9.433 |
| ⑤ | 1.784 |
| ⑥ | 1.016 |
| ⑦ | 12.654 |
| ⑧ | 1.983 |
| ⑨ | 13.555 |
| ⑩ | 0.601 |
| ⑪ | 10.403 |
| ⑫ | 15.270 |
| ⑬ | 4.429 |
| ⑭ | 13.611 |
| ⑮ | 1.184 |
| ⑯ | 2.945 |
---
🔍 Explanation Summary:
- Always
align decimals vertically.
- Add or subtract digit by digit, starting from the rightmost place (thousandths).
- Use
zero padding if needed (e.g., 3.997 is fine, no need to add extra zeros).
- Keep answers in
thousandths (three decimal places), even if trailing zeros are present (like 0.770 instead of 0.77).
Let me know if you'd like this formatted as a printable answer key!
Parent Tip: Review the logic above to help your child master the concept of addition and subtraction decimals worksheets.
