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I'll go through each problem step-by-step for clarity:

1. **(25 + 30) × 10**
   \[
   25 + 30 = 55
   \]
   \[
   55 \times 10 = 550
   \]
   The correct answer is **550**.

2. **80 + (4 + 4) - 7**
   \[
   4 + 4 = 8
   \]
   \[
   80 + 8 - 7 = 81
   \]
   The correct answer is **81**.

3. **266 - 6 × 3 + 3**
   - Follow the order of operations (PEMDAS/BODMAS).
   \[
   6 \times 3 = 18
   \]
   \[
   266 - 18 + 3 = 251
   \]
   The correct answer is **251**.

4. **9 × (47 - 22) ÷ 25**
   \[
   47 - 22 = 25
   \]
   \[
   9 \times 25 = 225
   \]
   \[
   225 \div 25 = 9
   \]
   The correct answer is **9**.

5. **10 × 66 + 66**
   \[
   10 \times 66 = 660
   \]
   \[
   660 + 66 = 726
   \]
   The correct answer is **726**.

6. **5 - 3 + 10 - 5**
   - Solve from left to right.
   \[
   5 - 3 = 2
   \]
   \[
   2 + 10 = 12
   \]
   \[
   12 - 5 = 7
   \]
   The correct answer is **7**.

7. **18 + (8 - 5) + 7 × 2 + 6 × (4 + 2)**
   \[
   8 - 5 = 3
   \]
   \[
   4 + 2 = 6
   \]
   \[
   7 \times 2 = 14
   \]
   \[
   6 \times 6 = 36
   \]
   \[
   18 + 3 + 14 + 36 = 71
   \]
   The correct answer is **71**.

8. **3 + 12 ÷ 4 + 3 × 5**
   - Follow the order of operations.
   \[
   12 \div 4 = 3
   \]
   \[
   3 \times 5 = 

(25 + 30) × 10, 80 + (4 + 4) - 7, 266 - 6 × 3 + 3, etc.

Learn how to solve various arithmetic problems using the order of operations (PEMDAS/BODMAS) and other arithmetic principles. This detailed step-by-step guide covers problems like (25 + 30) × 10, 80 + (4 + 4) - 7, 266 - 6 × 3 + 3, and more. Suitable for students in Grades 4-6.

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