Why is it important to differentiate between the main idea and details?

• A. To memorize every fact.
• B. To comprehend the purpose of a passage effectively.
• C. To identify biased language.
• D. To evaluate sentence structure.

Answer: (B)

Differentiating between the main idea and the details helps you grasp the purpose of a passage. The main idea is the central message or claim the author wants you to take away. Details are the facts, examples, and explanations that support or illustrate that message. When you separate the two, you can see how every part of the text is working toward that purpose, which makes the overall meaning easier to understand.

This skill directly supports comprehension: you can identify what the author is trying to convey and why, which lets you summarize the passage more accurately and follow the argument or explanation more clearly. For example, if a paragraph argues that recycling reduces waste, the main idea centers on that claim, while the details show data and examples that back it up. Focusing on that connection helps you see the writer’s intent and assess how effectively the text achieves it.

Trying to memorize every fact is not the goal here, and while detecting biased language or evaluating sentence structure are useful skills, they’re different tasks that don’t capture the main purpose of distinguishing main idea from details.