Of course! Let's solve each of the decimal addition and subtraction problems step by step. The key to adding and subtracting decimals is to
line up the decimal points so that digits in the same place value are aligned. Then, perform the operation just like with whole numbers, and bring the decimal point straight down into the answer.
---
✔ Problem 1: `22.774 + 8.874`
Align decimals:
```
22.774
+ 8.874
--------
31.648
```
✔ Answer: 31.648
---
✔ Problem 2: `99.37 + 88.42`
Align decimals (add trailing zero if needed for clarity):
```
99.370
+ 88.420
--------
187.790 → 187.79
```
✔ Answer: 187.79
---
✔ Problem 3: `66.344 - 33.122`
Align decimals:
```
66.344
- 33.122
--------
33.222
```
✔ Answer: 33.222
---
✔ Problem 4: `98.145 + 24.21`
Align decimals (add trailing zero):
```
98.145
+ 24.210
--------
122.355
```
✔ Answer: 122.355
---
✔ Problem 5: `9.8 - 0.8`
Align decimals:
```
9.8
- 0.8
-----
9.0 → 9
```
✔ Answer: 9
---
✔ Problem 6: `5.7 + 5.9`
Align decimals:
```
5.7
+ 5.9
-----
11.6
```
✔ Answer: 11.6
---
✔ Problem 7: `19.19 - 17.17`
Align decimals:
```
19.19
- 17.17
--------
2.02
```
✔ Answer: 2.02
---
✔ Problem 8: `122.37 + 23.48`
Align decimals:
```
122.37
+ 23.48
--------
145.85
```
✔ Answer: 145.85
---
✔ Problem 9: `9.3 - 4.9`
Align decimals:
```
9.3
- 4.9
-----
4.4
```
✔ Answer: 4.4
---
✔ Problem 10: `257.17 - 253.59`
Align decimals:
```
257.17
-253.59
--------
3.58
```
✔ Answer: 3.58
---
✔ Problem 11: `8.7 + 6.63`
Align decimals (add trailing zero):
```
8.70
+ 6.63
--------
15.33
```
✔ Answer: 15.33
---
✔ Problem 12: `69.67 - 67.69`
Align decimals:
```
69.67
- 67.69
--------
1.98
```
✔ Answer: 1.98
---
✔ Problem 13: `0.17 - 0.09`
Align decimals:
```
0.17
- 0.09
------
0.08
```
✔ Answer: 0.08
---
✔ Problem 14: `8.27 + 18.97`
Align decimals:
```
8.27
+ 18.97
--------
27.24
```
✔ Answer: 27.24
---
✔ Problem 15: `14.33 - 2.17`
Align decimals:
```
14.33
- 2.17
--------
12.16
```
✔ Answer: 12.16
---
✔ Problem 16: `637.9 - 216.6`
Align decimals:
```
637.9
-216.6
-------
421.3
```
✔ Answer: 421.3
---
## 📋 Final Answers (in order):
| Problem | Answer |
|---------|------------|
| 1 | 31.648 |
| 2 | 187.79 |
| 3 | 33.222 |
| 4 | 122.355 |
| 5 | 9 |
| 6 | 11.6 |
| 7 | 2.02 |
| 8 | 145.85 |
| 9 | 4.4 |
| 10 | 3.58 |
| 11 | 15.33 |
| 12 | 1.98 |
| 13 | 0.08 |
| 14 | 27.24 |
| 15 | 12.16 |
| 16 | 421.3 |
---
Let me know if you’d like a printable version or step-by-step work shown vertically for each problem!
Parent Tip: Review the logic above to help your child master the concept of addition and subtraction decimals worksheet.
