Let’s solve each problem step by step. We’ll line up the decimal points and add or subtract carefully.
---
1. 22.774 + 8.874
Line them up:
```
22.774
+ 8.874
--------
31.648
```
✔ Answer:
31.648
---
2. 99.37 + 88.42
```
99.37
+ 88.42
-------
187.79
```
✔ Answer:
187.79
---
3. 66.344 - 33.122
```
66.344
- 33.122
--------
33.222
```
✔ Answer:
33.222
---
4. 98.145 + 24.21
Add a zero to make it easier: 24.210
```
98.145
+ 24.210
--------
122.355
```
✔ Answer:
122.355
---
5. 9.8 - 0.8
```
9.8
- 0.8
-----
9.0 → just 9
```
✔ Answer:
9
---
6. 5.7 + 5.9
```
5.7
+ 5.9
-----
11.6
```
✔ Answer:
11.6
---
7. 19.19 - 17.17
```
19.19
- 17.17
-------
2.02
```
✔ Answer:
2.02
---
8. 122.37 + 23.48
```
122.37
+ 23.48
-------
145.85
```
✔ Answer:
145.85
---
9. 9.3 - 4.9
Think: 9.3 minus 4 is 5.3, then minus 0.9 more → 5.3 - 0.9 = 4.4
Or vertically:
```
9.3
- 4.9
-----
4.4
```
✔ Answer:
4.4
---
10. 257.17 - 253.59
```
257.17
-253.59
-------
3.58
```
Check: 253.59 + 3.58 = 257.17
✔
✔ Answer:
3.58
---
11. 8.7 + 6.63
Write 8.7 as 8.70
```
8.70
+ 6.63
------
15.33
```
✔ Answer:
15.33
---
12. 69.67 - 67.69
```
69.67
-67.69
------
1.98
```
Check: 67.69 + 1.98 = 69.67
✔
✔ Answer:
1.98
---
13. 0.17 - 0.09
```
0.17
- 0.09
------
0.08
```
✔ Answer:
0.08
---
14. 8.27 + 18.97
```
8.27
+ 18.97
-------
27.24
```
✔ Answer:
27.24
---
15. 14.33 - 2.17
```
14.33
- 2.17
------
12.16
```
✔ Answer:
12.16
---
16. 637.9 - 216.6
Write 637.9 as 637.90
```
637.90
-216.60
-------
421.30 → just 421.3
```
✔ Answer:
421.3
---
Final Answer:
31.648, 187.79, 33.222, 122.355, 9, 11.6, 2.02, 145.85, 4.4, 3.58, 15.33, 1.98, 0.08, 27.24, 12.16, 421.3
Parent Tip: Review the logic above to help your child master the concept of adding decimal worksheet.
