Main Ideas in Passages
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Lesson overview
How to find the central idea of an SAT passage and rule out too-narrow or too-broad answers.
Go to lesson quiz →Exam guidance · Digital SAT Adaptive-Module Lens
Core idea (Evidence-Based Reading, Tone & Logical Inference): Every valid inference must be directly anchored in passage text — eliminate options with extreme quantifiers ('always', 'never') or out-of-scope leaps.
Pacing
~71s per Reading/Writing item; ~95s per Math item with built-in Desmos graphing calculator.
How SAT marks this
Module 1 accuracy unlocks the higher-ceiling Module 2; graph intersections in Desmos often beat manual algebra.
Watch out for
Solving for x instead of the expression requested in the final clause of the stem.
Lesson content
Overview — Main Ideas in Passages
How to find the central idea of an SAT passage and rule out too-narrow or too-broad answers. This lesson is at the beginner level — by the end, you'll be able to recognise this question type, apply a reliable method, and avoid the traps that cost marks.
Key Concept
SAT Reading & Writing passages are short (25-150 words), so the main idea is almost always the single claim every sentence in the passage is built to support — not the topic, and not any one supporting detail.
Why It's Tested This Way
College Board tests main idea because the Digital SAT's format compresses a whole argument into a tiny passage, and quickly identifying its core claim is the skill every other question in that passage set depends on.
Method
Read the whole short passage once for its overall point before looking at answer choices, then eliminate any choice that is too narrow (restates only one detail) or too broad (goes beyond what the passage actually claims).
Worked Example
A passage describes a scientist's experiment and ends 'These results suggest the effect was caused by temperature, not humidity, as previously assumed.' The main idea is the reattribution of cause to temperature — not the experiment's specific numbers.
Second Worked Example
A passage on a historical figure lists three achievements, then concludes 'this range of accomplishments reflects an unusually versatile career.' The main idea is the claim about versatility, not any single achievement — an answer naming just one achievement is too narrow.
Common Traps
The most common trap is a choice that repeats a specific fact or number that appeared in the passage — vivid but too narrow — which test-takers pick because they recognize it, not because it's actually the passage's overall point.
Lesson Summary
Remember: (1) identify what is being asked, (2) apply the SAT strategy, (3) check against the traps. Complete the 10-question quiz below to unlock the next lesson — you need at least 60% to pass.
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