South Dakota ELA 9-10.RI.2.a

ELAGrades 9–10Reading Informational Text

The Standard

Analyze its development over the course of the text, including how it is introduced, built, and refined by specific details.

South Dakota English Language Arts Standards (2025)

Teacher's field guide

What Students Need to Do: Students identify the main idea in an informational text. They track how details in the opening, middle, and end support it or make it more precise.
What Mastery Looks Like: A student can state the main idea, not just the topic. They can point to details from different parts of the text and explain what each adds or changes.
Common Misconceptions: Students may name a topic, like school start times, instead of an idea the author develops. They may list details without explaining their effect, or treat a later qualification as a new idea.
How to Assess It: On an exit ticket, ask students to state the main idea of the school start times article. Have them name one detail from the opening, middle, and end, and explain what each adds.

Lesson moves

Give pairs a school start times article and three sticky notes to mark the first claim, new evidence, and a later qualification.
Ask, "How does the final paragraph change your first reading of the article's main idea?" Require two quoted details.
Play detail sort: teams place five article excerpts under "introduces," "adds support," or "adds nuance," then defend one choice.
Read a mock bus-route notice with rider counts and a safety concern; ask how the safety detail changes the notice's main point.

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A ready-to-print activity worksheet aligned to 9-10.RI.2.a, with an answer key for the teacher on its own page. No account needed.

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