Let's solve the expression \( 2.48 - 31 \times 0.4 + 2.8 \times 0.7 \).

1. **Multiplication** comes first:
   \[
   31 \times 0.4 = 12.4
   \]
   \[
   2.8 \times 0.7 = 1.96
   \]

2. **Subtraction** and **Addition**:
   \[
   2.48 - 12.4 + 1.96
   \]
   First, subtract:
   \[
   2.48 - 12.4 = -9.92
   \]
   Then add:
   \[
   -9.92 + 1.96 = -7.96
   \]

The final answer is **-7.96**.

Would you like more details or have any questions? Here are some related questions:

1. How does changing the multiplication factors affect the final result?
2. What happens if you change the order of operations in this expression?
3. How would the answer differ if you had used division instead of multiplication?
4. Can you solve a similar expression but with different operators (e.g., division, addition)?
5. How can negative results occur in these types of calculations?

**Tip:** Always follow the correct order of operations: handle multiplication and division before addition and subtraction.

Explore how to solve a mathematical expression involving order of operations: 2.48 - 31 × 0.4 + 2.8 × 0.7. Step-by-step solution provided with detailed explanations on handling multiplication, subtraction, and addition. Suitable for students in Grades 6-8.

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