Let's solve each expression step by step:

1. \( 1 + 4 = 5 \)

2. \( 9 - 2 \times 3 = 9 - 6 = 3 \)  
   (Remember, multiplication is done before subtraction due to the order of operations, also known as **PEMDAS/BODMAS** rules.)

3. \( (7 - 5) \times (3 + 1) = 2 \times 4 = 8 \)  
   (First, evaluate inside the parentheses, then multiply the results.)

### Final answers:
1. \( 1 + 4 = 5 \)
2. \( 9 - 2 \times 3 = 3 \)
3. \( (7 - 5) \times (3 + 1) = 8 \)

Would you like any details or further explanations?

Here are some related questions for practice:
1. \( 8 + 6 \times 2 - 3 = \)
2. \( (10 - 3) \times (5 + 2) = \)
3. \( 15 - 4 \times 2 + 6 = \)
4. \( (6 + 2) \div 2 \times 3 = \)
5. \( (12 - 4) \times (2 + 3) = \)

**Tip:** Always perform multiplication and division before addition and subtraction when solving expressions without parentheses!

Discover how to solve arithmetic expressions using the order of operations (PEMDAS/BODMAS) with step-by-step solutions for problems like 1 + 4, 9 - 2 × 3, and (7 - 5) × (3 + 1). Learn key concepts and improve your math skills, suitable for students in Grades 4-6.

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