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Let's solve these problems one by one.

1. **80 + 13 =**  
   \( 80 + 13 = 93 \)

2. **100 - 30 =**  
   \( 100 - 30 = 70 \)

3. **100 - 55 =**  
   \( 100 - 55 = 45 \)

4. **50 - 8 =**  
   \( 50 - 8 = 42 \)

5. **40 + 36 =**  
   \( 40 + 36 = 76 \)

6. **90 + 18 =**  
   \( 90 + 18 = 108 \)

7. **67 - 7 =**  
   \( 67 - 7 = 60 \)

8. **100 - 71 =**  
   \( 100 - 71 = 29 \)

9. **100 - 6 =**  
   \( 100 - 6 = 94 \)

Here are the answers:
- **80 + 13 = 93**
- **100 - 30 = 70**
- **100 - 55 = 45**
- **50 - 8 = 42**
- **40 + 36 = 76**
- **90 + 18 = 108**
- **67 - 7 = 60**
- **100 - 71 = 29**
- **100 - 6 = 94**

Would you like further details on these calculations, or do you have any questions?

Here are some related questions for practice:
1. What is \( 75 + 15 \)?
2. How would you solve \( 90 - 25 \) mentally?
3. What is the result of \( 100 - 47 \)?
4. Can you calculate \( 63 + 37 \) mentally?
5. What is \( 100 - 19 \) using subtraction?

**Tip:** When adding or subtracting numbers, break them into tens and units to make mental calculation easier. For example, \( 80 + 13 \) can be split into \( 80 + 10 = 90 \) and then add the remaining 3 to get 93.

Resuelve mentalmente las sumas y restas:

1. 80 + 13
2. 100 - 30
3. 100 - 55
4. 50 - 8
5. 40 + 36
6. 90 + 18
7. 67 - 7
8. 100 - 71
9. 100 - 6

Practice mental math with basic addition and subtraction problems like 80 + 13, 100 - 30, and more. Designed for Grade 2 students to improve arithmetic skills.

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