Reading Comprehension Main Idea and Detail
This topic covers main idea, supporting ideas, inference, application, logical structure, style, and reading quantitative concepts in passages.
How to study for the GMAT
Build every answer around the exact decision: problem setup, argument gap, passage support, data source, sufficiency, table filter, graph label, or linked two-part condition.
Core concepts
Concept 1
Reading Comprehension Main Idea and Detail questions test the reasoning and decision skills used on the current GMAT exam.
Exam cue: Name the task type: problem solving, reading comprehension, critical reasoning, data sufficiency, multi-source reasoning, table analysis, graphics interpretation, or two-part analysis.
Concept 2
The strongest answer identifies the business-relevant task, data source, argument relationship, arithmetic setup, or decision criterion before comparing choices.
Exam cue: Check constraints, units, variables, claim structure, source tabs, table filters, graph axes, and whether the answer is enough to make the decision.
Concept 3
Eliminate choices that answer a different question, overlook a condition, misuse a source, ignore sufficiency, or rely on specialized outside knowledge.
Exam cue: Use review and edit time to verify the exact question, not just the topic that first looked familiar.
Risk pitfalls and guardrails
Solving a nearby math or reading task while missing the decision the item actually asks for.
Guardrail: Use a 15-second safety pause before finalizing your action.
Using outside business knowledge instead of the evidence, data, or argument in the prompt.
Guardrail: Use a 15-second safety pause before finalizing your action.
Ignoring GMAT-specific constraints such as no calculator in Quant and sufficiency rather than calculation in Data Insights.
Guardrail: Use a 15-second safety pause before finalizing your action.
Memory anchors
Main Idea
The main idea captures the passage's central argument or explanation.
Supporting Idea
A supporting idea provides evidence, example, or explanation for the main idea.
Detail
A detail answer must match what the passage states.
Inference
An inference must follow from the passage without adding outside assumptions.
Application
An application question asks how a passage idea applies to a new situation.
Logical Structure
Logical structure describes how the passage organizes claims and evidence.
Style
Style reflects tone, emphasis, and rhetorical approach.
Quantitative Concept
A quantitative concept in a passage should be interpreted from context and wording.
Scope
Scope prevents answers from being too broad or too narrow.
Author Purpose
Author purpose explains what the author is trying to accomplish.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
Passage: City planners often justify street trees by citing shade and visual appeal. Yet a recent heat-mapping project found that isolated trees did little to lower afternoon temperatures beyond their immediate canopies. Blocks with connected bands of mature trees were markedly cooler, because the overlapping canopies shaded pavement continuously and released more moisture collectively. The findings suggest that planting targets based only on the number of trees may miss the feature that matters most. What is the main idea of the passage?
Passage: City planners often justify street trees by citing shade and visual appeal. Yet a recent heat-mapping project found that isolated trees did little to lower afternoon temperatures beyond their immediate canopies. Blocks with connected bands of mature trees were markedly cooler, because the overlapping canopies shaded pavement continuously and released more moisture collectively. The findings suggest that planting targets based only on the number of trees may miss the feature that matters most. According to the passage, why were blocks with connected bands of trees cooler?
Answer all questions to submit.
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