Let’s solve each decimal addition problem step by step. We’ll line up the decimals and add from right to left, just like whole numbers — but keep the decimal point in the same place!
---
**Problem 1:
5.6 + 0.3**
Write it with aligned decimals:
```
5.6
+ 0.3
-----
```
Add tenths: 6 + 3 = 9 → write .9
Add ones: 5 + 0 = 5 → write 5
→
5.9
✔ Matches answer key.
---
**Problem 2:
17.02 + 1.12**
Align decimals:
```
17.02
+ 1.12
-------
```
Hundredths: 2 + 2 = 4
Tenths: 0 + 1 = 1
Ones: 7 + 1 = 8
Tens: 1 + 0 = 1
→
18.14
✔ Matches answer key.
---
**Problem 3:
7.4 + 0.5**
Align:
```
7.4
+ 0.5
-----
```
Tenths: 4 + 5 = 9 → .9
Ones: 7 + 0 = 7
→
7.9
✔ Matches answer key.
---
**Problem 4:
82.47 + 1.12**
Align:
```
82.47
+ 1.12
-------
```
Hundredths: 7 + 2 = 9
Tenths: 4 + 1 = 5
Ones: 2 + 1 = 3
Tens: 8 + 0 = 8
→
83.59
✔ Matches answer key.
---
**Problem 5:
8.3 + 0.3**
Align:
```
8.3
+ 0.3
-----
```
Tenths: 3 + 3 = 6 → .6
Ones: 8 + 0 = 8
→
8.6
✔ Matches answer key.
---
**Problem 6:
82.47 + 5.32**
Align:
```
82.47
+ 5.32
-------
```
Hundredths: 7 + 2 = 9
Tenths: 4 + 3 = 7
Ones: 2 + 5 = 7
Tens: 8 + 0 = 8
→
87.79
✔ Matches answer key.
---
All problems solved correctly! The answers match the provided answer key.
Final Answer:
5.9, 18.14, 7.9, 83.59, 8.6, 87.79
Parent Tip: Review the logic above to help your child master the concept of adding decimals 4th grade math worksheet.
