Addition exercises for children with three-digit numbers.

Problem Description:

The image contains a series of addition exercises involving decimal numbers. The task is to solve these addition problems step by step and provide the correct answers.

Solution:

#### First Row:
1. Problem:
$$
0.34 + 0.85
$$
- Align the decimal points:
```
0.34
+ 0.85
------
```
- Add the numbers:
- Tenths place: \( 4 + 5 = 9 \)
- Ones place: \( 0 + 0 = 0 \)
- Result: \( 1.19 \)

Answer:
$$
1.19
$$

2. Problem:
$$
2.74 + 6.61
$$
- Align the decimal points:
```
2.74
+ 6.61
------
```
- Add the numbers:
- Hundredths place: \( 4 + 1 = 5 \)
- Tenths place: \( 7 + 6 = 13 \) (carry over 1 to the ones place)
- Ones place: \( 2 + 6 + 1 = 9 \)
- Result: \( 9.35 \)

Answer:
$$
9.35
$$

3. Problem:
$$
5.85 + 2.25
$$
- Align the decimal points:
```
5.85
+ 2.25
------
```
- Add the numbers:
- Hundredths place: \( 5 + 5 = 10 \) (carry over 1 to the tenths place)
- Tenths place: \( 8 + 2 + 1 = 11 \) (carry over 1 to the ones place)
- Ones place: \( 5 + 2 + 1 = 8 \)
- Result: \( 8.10 \)

Answer:
$$
8.10
$$

4. Problem:
$$
6.65 + 8.85
$$
- Align the decimal points:
```
6.65
+ 8.85
------
```
- Add the numbers:
- Hundredths place: \( 5 + 5 = 10 \) (carry over 1 to the tenths place)
- Tenths place: \( 6 + 8 + 1 = 15 \) (carry over 1 to the ones place)
- Ones place: \( 6 + 8 + 1 = 15 \)
- Result: \( 15.50 \)

Answer:
$$
15.50
$$

---

#### Second Row:
1. Problem:
$$
4.000 + 6.021
$$
- Align the decimal points:
```
4.000
+ 6.021
------
```
- Add the numbers:
- Thousandths place: \( 0 + 1 = 1 \)
- Hundredths place: \( 0 + 2 = 2 \)
- Tenths place: \( 0 + 0 = 0 \)
- Ones place: \( 4 + 6 = 10 \)
- Result: \( 10.021 \)

Answer:
$$
10.021
$$

2. Problem:
$$
6.217 + 2.053
$$
- Align the decimal points:
```
6.217
+ 2.053
------
```
- Add the numbers:
- Thousandths place: \( 7 + 3 = 10 \) (carry over 1 to the hundredths place)
- Hundredths place: \( 1 + 5 + 1 = 7 \)
- Tenths place: \( 2 + 0 = 2 \)
- Ones place: \( 6 + 2 = 8 \)
- Result: \( 8.270 \)

Answer:
$$
8.270
$$

3. Problem:
$$
7.233 + 5.255
$$
- Align the decimal points:
```
7.233
+ 5.255
------
```
- Add the numbers:
- Thousandths place: \( 3 + 5 = 8 \)
- Hundredths place: \( 3 + 5 = 8 \)
- Tenths place: \( 2 + 2 = 4 \)
- Ones place: \( 7 + 5 = 12 \)
- Result: \( 12.488 \)

Answer:
$$
12.488
$$

---

#### Third Row:
1. Problem:
$$
6.080 + 2.020
$$
- Align the decimal points:
```
6.080
+ 2.020
------
```
- Add the numbers:
- Thousandths place: \( 0 + 0 = 0 \)
- Hundredths place: \( 8 + 2 = 10 \) (carry over 1 to the tenths place)
- Tenths place: \( 0 + 0 + 1 = 1 \)
- Ones place: \( 6 + 2 = 8 \)
- Result: \( 8.100 \)

Answer:
$$
8.100
$$

2. Problem:
$$
7.946 + 2.139
$$
- Align the decimal points:
```
7.946
+ 2.139
------
```
- Add the numbers:
- Thousandths place: \( 6 + 9 = 15 \) (carry over 1 to the hundredths place)
- Hundredths place: \( 4 + 3 + 1 = 8 \)
- Tenths place: \( 9 + 1 = 10 \) (carry over 1 to the ones place)
- Ones place: \( 7 + 2 + 1 = 10 \)
- Result: \( 10.085 \)

Answer:
$$
10.085
$$

3. Problem:
$$
0.933 + 4.288
$$
- Align the decimal points:
```
0.933
+ 4.288
------
```
- Add the numbers:
- Thousandths place: \( 3 + 8 = 11 \) (carry over 1 to the hundredths place)
- Hundredths place: \( 3 + 8 + 1 = 12 \) (carry over 1 to the tenths place)
- Tenths place: \( 9 + 2 + 1 = 12 \) (carry over 1 to the ones place)
- Ones place: \( 0 + 4 + 1 = 5 \)
- Result: \( 5.221 \)

Answer:
$$
5.221
$$

4. Problem:
$$
4.836 + 3.484
$$
- Align the decimal points:
```
4.836
+ 3.484
------
```
- Add the numbers:
- Thousandths place: \( 6 + 4 = 10 \) (carry over 1 to the hundredths place)
- Hundredths place: \( 3 + 8 + 1 = 12 \) (carry over 1 to the tenths place)
- Tenths place: \( 8 + 4 + 1 = 13 \) (carry over 1 to the ones place)
- Ones place: \( 4 + 3 + 1 = 8 \)
- Result: \( 8.320 \)

Answer:
$$
8.320
$$

---

#### Fourth Row:
1. Problem:
$$
6.3342 + 7.3724
$$
- Align the decimal points:
```
6.3342
+ 7.3724
------
```
- Add the numbers:
- Ten-thousandths place: \( 2 + 4 = 6 \)
- Thousandths place: \( 4 + 2 = 6 \)
- Hundredths place: \( 3 + 7 = 10 \) (carry over 1 to the tenths place)
- Tenths place: \( 3 + 3 + 1 = 7 \)
- Ones place: \( 6 + 7 = 13 \)
- Result: \( 13.7066 \)

Answer:
$$
13.7066
$$

2. Problem:
$$
1.0247 + 2.4563
$$
- Align the decimal points:
```
1.0247
+ 2.4563
------
```
- Add the numbers:
- Ten-thousandths place: \( 7 + 3 = 10 \) (carry over 1 to the thousandths place)
- Thousandths place: \( 4 + 6 + 1 = 11 \) (carry over 1 to the hundredths place)
- Hundredths place: \( 2 + 5 + 1 = 8 \)
- Tenths place: \( 0 + 4 = 4 \)
- Ones place: \( 1 + 2 = 3 \)
- Result: \( 3.4810 \)

Answer:
$$
3.4810
$$

3. Problem:
$$
1.0247 + 4.20
$$
- Align the decimal points:
```
1.0247
+ 4.2000
------
```
- Add the numbers:
- Ten-thousandths place: \( 7 + 0 = 7 \)
- Thousandths place: \( 4 + 0 = 4 \)
- Hundredths place: \( 2 + 0 = 2 \)
- Tenths place: \( 0 + 2 = 2 \)
- Ones place: \( 1 + 4 = 5 \)
- Result: \( 5.2247 \)

Answer:
$$
5.2247
$$

---

Final Answers:

$$
\boxed{
\begin{aligned}
&1.19, \, 9.35, \, 8.10, \, 15.50 \\
&10.021, \, 8.270, \, 12.488 \\
&8.100, \, 10.085, \, 5.221, \, 8.320 \\
&13.7066, \, 3.4810, \, 5.2247
\end{aligned}
}
$$