SAT Adding and Deleting Information: Deciding What Belongs in a Well-Written Passage

SAT writing includes questions that present a proposed addition or deletion and ask whether the change should be made. Adding questions may ask whether a sentence should be inserted, and if so, where. Deleting questions ask whether a sentence should be removed and why. The decision always hinges on two criteria: relevance (does the information support the passage's focus?) and coherence (does including or excluding the information preserve logical flow?).

The question stem typically provides a reason for the proposed change (e.g., "because it provides relevant background" or "because it distracts from the main focus"). Your job is to evaluate whether that stated reason is accurate. Always read the two to three sentences surrounding the proposed addition or deletion before evaluating the reason given in the answer choice, because context determines whether the information is truly relevant or disruptive.

For addition questions: If the proposed sentence directly supports the paragraph's topic sentence or the passage's central claim, it should be added. If it introduces a new topic not developed elsewhere, contradicts the passage's focus, or repeats information already stated, it should not be added. Ask: does this sentence make the argument clearer, more complete, or better supported? If yes, add it. If it just introduces tangential detail, do not add it.

Micro-example: a paragraph argues that urban parks reduce stress. A proposed addition states that urban parks were first popularized in the 19th century. This historical detail does not directly support the stress-reduction argument and introduces a tangential topic, so it should not be added. The single most reliable test for addition: after adding the sentence, ask whether the paragraph makes a stronger, clearer argument than it did before; if the paragraph feels no clearer or more compelling, the addition is unnecessary.

For deletion questions: If the sentence in question drifts from the paragraph's focus, repeats a point already made, or introduces a contradiction, it should be deleted. If the sentence provides important evidence, defines a key term first used in the passage, or creates a necessary logical bridge between two other sentences, it should be kept. Test by removing the sentence and reading the surrounding sentences: does the paragraph still make sense and maintain its flow?

Practice prompt: a passage argues that deep-sea exploration is underfunded. One sentence in the middle states that the ocean covers 71% of Earth's surface. If the passage already uses that statistic in the introduction, the repetition here is unnecessary, and the sentence should be deleted. If removing a sentence creates an abrupt jump between two ideas that now lack a logical connector, the sentence should be kept even if it feels tangential, because it may be providing an essential bridge.

Wrong answers in adding/deleting questions usually give an incorrect reason for a correct action or a correct reason for an incorrect action. For example, an answer might say "yes, add it because it provides an interesting historical fact" when the real criterion should be relevance, not interest. Always evaluate the reason in the answer choice, not just whether the action (add or delete) seems right. Both the action and the reason must be accurate.

Build speed by training yourself to make the add/delete decision before reading the answer choices, then confirm your decision by matching your reason to the answer that best expresses it. Spending ten seconds forming your own reasoning before looking at choices prevents answer choices from pulling you toward incorrect logic. In adding/deleting questions, students who pre-decide and then match answer choices make this question type twice as fast as students who evaluate each answer choice from scratch without pre-deciding.