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### Section 11: Выполните действия (Perform the operations)

1. \( (86 + 44) + (86 - 44) \)
   - Solution: \( (130) + (42) = 172 \)

2. \( (86 + 44) - (86 - 44) \)
   - Solution: \( (130) - (42) = 88 \)

3. \( (86 + 20) + (86 - 20) \)
   - Solution: \( (106) + (66) = 172 \)

4. \( (86 + 20) - (86 - 20) \)
   - Solution: \( (106) - (66) = 40 \)

5. \( (100 + 44) + (100 - 44) \)
   - Solution: \( (144) + (56) = 200 \)

6. \( (100 + 44) - (100 - 44) \)
   - Solution: \( (144) - (56) = 88 \)

### Section 12: Выполните действия (Perform the operations)

1. \( (328 + 733) - (228 + 533) \)
   - Solution: \( (1061) - (761) = 300 \)

2. \( 17937 - (6584 + 9698) \)
   - Solution: \( 17937 - (16282) = 1655 \)

3. \( (86 + 44) - (206 - 196) - 56 \)
   - Solution: \( 130 - 10 - 56 = 64 \)

4. \( (425 + 252 + 133) + (488 - 325) \)
   - Solution: \( 810 + 163 = 973 \)

5. \( 20736 - (2004 + 3074 - 1000) \)
   - Solution: \( 20736 - (4078) = 16658 \)

6. \( 96000 - 4844 + (3000 + 897) \)
   - Solution: \( 96000 - 4844 + 3897 = 95053 \)

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Would you like me to continue solving more sections or elaborate further on any of the steps? Here are five more problems that we can solve from the remaining sections:

1. Solve Section 13: \( 86 \times 9 \)
2. Solve Section 13: \( 39 \times 8 \)
3. Solve Section 14: \( 268 \times 2 \)
4. Solve Section 14: \( 491 \times 7 \)
5. Solve Section 15: \( 4296 \times 2 \)

**Tip:** Breaking down large numbers into smaller components can simplify mental calculations.

Solve a variety of arithmetic expressions, including addition, subtraction, and multiplication. This exercise covers basic arithmetic concepts and is suitable for students in Grades 4-6. Step-by-step solutions provided for each expression.

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