Difficulty: Easy
Correct Answer: 1040
Explanation:
Introduction / Context:
Both products have one factor near an integer: 8 and 4. Using those nearby integers and applying small corrections yields a near-exact sum, perfect for choosing among options spaced by tens.
Given Data / Assumptions:
Concept / Approach:
Compute with the nearest integer then adjust by the tiny residual. Since both residuals are very small, the nearest hundred or ten remains stable.
Step-by-Step Solution:
Verification / Alternative check:
Direct calculation gives about 1040.008, confirming the chosen option.
Why Other Options Are Wrong:
1090, 1200, 1120: All are 80–160 away from the refined sum ~1040; too far for these tiny corrections.
Common Pitfalls:
Skipping the small −0.002 adjustment in the first product leads to ~1016.06, but the second product still keeps the sum very near 1040; the same nearest choice results.
Final Answer:
1040
Discussion & Comments