Math Mountain Fun worksheet featuring addition and subtraction problems to find missing numbers in a mountain diagram.

The image presents a series of math problems involving addition and subtraction. Each problem is structured in a "Math Mountain" format, where the total (sum or difference) is at the top, and the addends or subtrahend/minuend are at the bottom. Let's solve each problem step by step.

---

Problem 1:

```
?
/ \
4 7
```
- Operation: Addition
- Calculation: \( 4 + 7 = 11 \)
- Answer:
```
11
/ \
4 7
```

---

Problem 2:

```
17
/ \
3 ?
```
- Operation: Subtraction
- Calculation: \( 17 - 3 = 14 \)
- Answer:
```
17
/ \
3 14
```

---

Problem 3:

```
?
/ \
12 5
```
- Operation: Addition
- Calculation: \( 12 + 5 = 17 \)
- Answer:
```
17
/ \
12 5
```

---

Problem 4:

```
20
/ \
? 6
```
- Operation: Subtraction
- Calculation: \( 20 - 6 = 14 \)
- Answer:
```
20
/ \
14 6
```

---

Problem 5:

```
?
/ \
15 3
```
- Operation: Addition
- Calculation: \( 15 + 3 = 18 \)
- Answer:
```
18
/ \
15 3
```

---

Problem 6:

```
17
/ \
7 ?
```
- Operation: Subtraction
- Calculation: \( 17 - 7 = 10 \)
- Answer:
```
17
/ \
7 10
```

---

Problem 7:

```
?
/ \
4 16
```
- Operation: Addition
- Calculation: \( 4 + 16 = 20 \)
- Answer:
```
20
/ \
4 16
```

---

Problem 8:

```
?
/ \
8 9
```
- Operation: Addition
- Calculation: \( 8 + 9 = 17 \)
- Answer:
```
17
/ \
8 9
```

---

Problem 9:

```
13
/ \
12 ?
```
- Operation: Subtraction
- Calculation: \( 13 - 12 = 1 \)
- Answer:
```
13
/ \
12 1
```

---

Problem 10:

```
19
/ \
? 7
```
- Operation: Subtraction
- Calculation: \( 19 - 7 = 12 \)
- Answer:
```
19
/ \
12 7
```

---

Problem 11:

```
?
/ \
11 6
```
- Operation: Addition
- Calculation: \( 11 + 6 = 17 \)
- Answer:
```
17
/ \
11 6
```

---

Problem 12:

```
14
/ \
? 4
```
- Operation: Subtraction
- Calculation: \( 14 - 4 = 10 \)
- Answer:
```
14
/ \
10 4
```

---

Final Answers:

1. \( 11 \)
2. \( 14 \)
3. \( 17 \)
4. \( 14 \)
5. \( 18 \)
6. \( 10 \)
7. \( 20 \)
8. \( 17 \)
9. \( 1 \)
10. \( 12 \)
11. \( 17 \)
12. \( 10 \)

Boxed Final Answer:
\[
\boxed{11, 14, 17, 14, 18, 10, 20, 17, 1, 12, 17, 10}
\]