Digital SAT October 2026 10K — Question-Bank Study Guide: Data, Causation, and Lost Roots

Last updated: October 2026 · By the AllSatPapers Content Team

October 2026 Digital SAT Question Bank 10K is the largest of the two October banks in this folder by printed question count. The 888-page PDF contains 443 Reading and Writing questions, 435 Math questions, and ten pages of answer tables: 878 question occurrences altogether. The two sections use continuous numbering within each section rather than the multiple-set structure of 10J.

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What’s Inside the 10K File?

That organization makes targeted review straightforward if section names stay attached to question numbers. Reading and Writing runs from pages 1–443, followed by five key pages; Math runs from pages 449–883, followed by another five key pages. Treat the collection as a source for selected drills. Its size is not evidence of how many questions are unique or how often any question will appear again.

Source and key notes: The count is based on every question footer and all ten key pages. It counts occurrences, not deduplicated questions. The three displayed entries were checked; the remaining answer tables have not been independently solved in full. The Reading and Writing key has dash placeholders at Q111 (p.445), Q264 (p.446), and Q328 (p.447); treat these three entries as unanswered.

Use the bank to separate related skills

10K’s 443 RW and 435 Math question occurrences make it a substantial practice resource, but the numbered pages should be used as a bank rather than presumed to be one administered form. RW occupies pp.1–443 and Math pp.449–883, with separate answer-table groups. The counts describe occurrences in the supplied file; they do not establish how many questions are unique. Keep the section with every question number because both sections restart their numbering.

The RW bank supports several distinct review clusters. Q1 (p.1) asks for a contextual meaning in a passage about Georgina Pazcoguin. Q11 (p.11) uses a graph to support the conclusion that none of three countries’ timber industries grows all 23 species under study. Q64 (p.64) contrasts employment totals with workforce shares. Q266 (p.266) draws a limited inference about introduced birds spreading native seeds, and Q286 (p.286) connects an instrument’s vibrating strings to its classification. These are different reasoning operations: contextual vocabulary, upper-bound evidence, count-versus-percentage interpretation, qualified inference, and logical consequence. Grouping them only as “reading” hides the skill that actually needs repair.

Math: preserve information while simplifying

Math Q1 (p.449) evaluates a linear function. Q21 (p.469) contains a shared factor and asks for a parameter using the sum of roots; canceling that factor would lose a solution. Q47 (p.495) asks when an equation holds for infinitely many values. Later, Q240 (p.688) asks what feature of an experiment supports a causal conclusion. The bank therefore tests both symbolic manipulation and interpretation. Fast algebra is useful only when it preserves the solutions or relationships relevant to the question.

A productive progression is to move from reading a formula, to transforming it, to explaining why the transformation is valid. For the shared-factor equation, moving everything to one side retains the zero-factor possibility; division by that factor does not. For the identity, matching one coefficient is insufficient unless the constants match too. For the experiment, random selection and random assignment have different purposes even though both contain the word “random.” These distinctions make useful error-log headings. The three dashed RW key entries are a separate source issue: do not use an absent key answer as evidence that your reasoning is wrong. The worked cases below focus on questions with interpretable answer support.

Sample Questions — Answers and Reasoning

Reading & Writing Q1 — A direct contextual definition

Source excerpt, PDF p.1: “a forthright, open portrait of ballet culture”

Included key: C, “candid” (p.444). The description tells us that Georgina Pazcoguin wanted to write openly and honestly about ballet culture. “Candid” expresses that quality. “Aloof” concerns distance or reserve; “meticulous” concerns care with detail; “idealistic” concerns ideals. Those may be plausible book descriptions in isolation, but only candid restates the stated aim. Use the passage’s paired adjectives as the definition of the missing word.

The word “candid” fits the passage’s frank treatment of experiences. Check the nature of the description rather than assuming that any positive adjective would work. A contextual vocabulary answer should explain how the writing presents its subject, not merely whether the subject is interesting or admirable.

Math Q1 — Recheck the input in a familiar function

Source excerpt, PDF p.449: “h(x) = 100x − 70; x = 5”

Included key: B, 430 (p.884); calculation checked by our team. Compute 100(5) − 70 = 430. Form 10F’s visible math opener uses the same function at x = 2, producing 130. That small change is the entire task: the correct method transfers, the answer does not. A familiar expression should trigger a careful rereading of the requested input, not automatic recall of the earlier number.

At x=5, the calculation is 100(5)−70=430. Distinguish the input from the constant term, and keep the minus sign attached to 70. A quick substitution check is sufficient for this opening item; the saved time is better spent on a later question where the target or permissible transformation is less obvious.

Math Q21 — Do not cancel away a solution

Source excerpt, PDF p.469: “15(w − a)(w + 9) = 5(w + 9)”

Included key: 19 (p.884); calculation checked by our team. Move everything left and factor: (w + 9)[15(w − a) − 5] = 0. The solutions are w = −9 and w = a + 1/3. Their sum is a − 26/3, and the question sets that sum to 31/3. Thus a = 57/3 = 19. Dividing by w + 9 at the start would discard w = −9 and lead to the wrong parameter.

After factoring, the solutions are w=−9 and w=a+1/3. Their sum is a−26/3, which equals 31/3, giving a=19. The first root is precisely the one that would disappear if you divided by w+9. A safe alternative is to expand first and use the quadratic root-sum formula, but the factored approach makes the lost-root risk visible.

Reading & Writing Q64 — Growth in count, decline in share

Source: PDF p.64. Included key: C (p.444).

The table shows business-sector employment increasing from 220,700 to 232,300 while the sector’s workforce share falls from 66.0% to 65.4%. C correctly notes that the share decline did not result from an overall contraction in the sector’s employee count. The increase is 11,600 workers, even though the fraction of the total is smaller.

A offers a causal explanation based on the smallest subcategory, but a small count does not establish why the overall percentage changed. B incorrectly says leisure and hospitality’s percentage rose; it falls from 55.3% to 54.2%. D describes workers moving between sectors, something the two-date totals do not track. Those distractors go beyond or contradict the actual measurements.

The efficient check is to read the unit in each column before comparing values. Counts and percentages can move in opposite directions because percentages have a denominator. You do not need to reconstruct every workforce total to answer this question. A precise statement of what rose, what fell, and what the table cannot show is enough.

Math Q240 — Causation depends on assignment, not just a large sample

Source: PDF p.688. Included key: D (p.886).

The question’s hypothetical study randomly selects 150 adults from a community center, then randomly assigns them to supplement or placebo conditions. The feature supporting the causal comparison is the random assignment. It aims to make treatment groups comparable so that a systematic outcome difference can be attributed to the intervention within the study’s design.

The random sample addresses a different issue: whether participants can represent the population from which they were selected. Having more than 100 participants does not by itself prevent confounding. Measuring again after six weeks describes the outcome schedule but does not create comparable treatment groups. A before-and-after difference without suitable assignment could have another explanation.

Match the design feature to the verb in the claim. “Caused” directs attention to treatment assignment; “represents” would direct attention to sampling. The study topic is incidental to this statistical distinction. Treat the scenario as a Math reasoning problem rather than independent evidence for a real-world supplement recommendation. No numerical calculation is required, so spend the time checking which kind of randomization the question asks about.

Six Earlier-Form Comparisons: What Transfers and What Changes

These comparisons distinguish a near-repeat, a changed version of the same question family, and a broader skill analogue. Earlier archived-record page numbers identify the retained question record, which may differ from the pagination of another PDF edition. A shared topic or method does not establish a whole-form overlap percentage.

1. 2026 6H, R&W question bank, Q1, PDF p.1 → 10K, R&W question bank, Q11, PDF p.11

Near-repeat. The timber-species question retains the conclusion that none of the three countries reaches all 23 species. The supporting statement uses the largest reported count as an upper bound: even the country with the most is below 15, so all are below 23. This is stronger than merely naming some species or asserting a lower bound. The choices move between files, but the evidence structure is unchanged. Explain why an upper bound supports “none reaches the total.”

2. 2025 11B, R&W Module 2, Q2, archived record p.11 → 10K, R&W question bank, Q286, PDF p.286

Near-repeat. The guqin passage retains a cause-to-classification relationship: vibrating strings identify it as a chordophone under the stated system. “Thus” marks the resulting classification. “Similarly” would require a comparison, and “Furthermore” would merely add a fact. The unchanged reasoning makes this a useful short transition drill. State the premise and its consequence before selecting a connector, rather than choosing a word because the two sentences concern the same instrument.

3. 2025 10F, R&W Module 1, Q15, archived record p.14 → 10K, R&W question bank, Q266, PDF p.266

Near-repeat. The zebra-dove passage retains the seed-spreading benefit to native Oahu plants. The supported conclusion is that some introduced birds provide a benefit in the described setting. The earlier choice order differs, and the general opening warning does not prove that these birds previously caused harm. This pair trains restraint: do not convert one documented benefit into a universal endorsement or add a before-and-after history the passage does not supply.

4. 2026 8G, Math Module 1, Q7, PDF p.63 → 10K, Math question bank, Q240, PDF p.688

Skill analogue. August’s coral-temperature experiment and October’s supplement-placebo scenario both ask what supports causation. The participants and treatments change, but random assignment remains the relevant feature. The shared skill is study-design interpretation, not subject knowledge. Explain why selecting a random sample and assigning treatments at random are different operations. The first concerns representation; the second concerns a fair causal comparison between groups.

5. 2025 8D, Math Module 2, Q21, archived record p.69 → 10K, Math question bank, Q21, PDF p.469

Same-family retune. August’s archived equation has the shared factor w+5, while October has w+9 and a different stated root sum. Both require retaining the solution that makes the shared factor zero. Moving all terms to one side and factoring protects that root; dividing it away does not. The changed coefficients and root sum mean the parameter must be recomputed. This is a strong transfer pair for checking whether a student understands why a canceled factor can remove information.

6. 2025 10A, Math Module 2, Q9, archived record p.86 → 10K, Math question bank, Q47, PDF p.495

Same-family retune. The earlier identity distributes terms before comparing constants. October’s 13x+351=a(x+27) places the same parameter in the x coefficient and constant. Infinitely many solutions require both to match. Setting a=13 gives 27a=351 as well, completing the check. One successful substitution for x would establish only one solution; comparing expressions establishes an identity. Keep that distinction explicit when reviewing this family.

Tips for Students Using 10K

• Distinguish Reading and Writing Q1 from Math Q1 in your notes.
• Choose drills by weakness instead of moving through 878 questions without review.
• Read the input again when a function looks familiar.
• Factor an equation before cancelling an expression that may equal zero.
• Count repeat exposure separately from first-attempt accuracy.

A Focused Review Sequence

Create short mixed sets from the bank rather than simply moving page by page. Combine one vocabulary item, one graph or table claim, one equation with a parameter, and one study-design question. After checking, record the mechanism of the error: wrong denominator, unsupported cause, lost zero factor, or confused randomization. Then find a related earlier-form example and explain what changed. Success means the method transfers to the new wording or numbers, not that the next answer is familiar. Keep unkeyed entries out of any automatically scored summary until they have been reviewed independently.

Every Digital SAT Paper in Our Archive

Our archived files are grouped below by their supplied labels; regional labels and dates describe the archive, rather than independent authentication of an administration.

2023

• March 2023 (3A) · May 2023 (5A) · June 2023 (6A, Easy & Hard) · October 2023 (10A) · November 2023 (11A) · December 2023 (12A–12D)

2024

• March 2024 (3A–3D) · May 2024 (5A–5D) · June 2024 (6A–6E) · August 2024 (8A–8I) · October 2024 (10A–10G) · November 2024 (11A–11F) · December 2024 (12A–12H)

2025

• March 2025 (3A–3H) · May 2025 (5A–5F) · June 2025 (6A–6E) · August 2025 (8A–8F + 8G Question Bank) · September 2025 (9A–9I + 9J Question Bank) · October 2025 (10A–10H, 10I/10J School Day, 10K Question Bank) · November 2025 (11A–11G) · December 2025 (12A Math only, 12B English only, 12C, 12D, 12E, 12F Question Bank)

2026

• March 2026 (3A Question Bank, 3B, 3C US, 3D US English only) · May 2026 (5A, 5B, 5C–5H English only) · June 2026 (6A–6D, 6E Math only, 6F/6G English only, 6H Question Bank, 6I–6K) · August 2026 (8A–8D International, 8E collection labeled “4Sets”, 8F/8G US, 8H International Question Bank) · September 2026 (9A–9C International, 9D–9H US, 9I International Question Bank) · October 2026 (10A–10D International, 10E International English only, 10F–10I US, 10J International Question Bank, 10K US Question Bank; School Day files labeled October 8, October 13 sets 1/2, October 14, October 17 sets 1/2).

Use this October 2026 Digital SAT 10K breakdown to turn an answer check into an explanation you can repeat. For more SAT past-paper practice, get the October 2026 SAT bundle and work through related forms with a record of what changed.

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Keywords: October 2026 Digital SAT, SAT 10K, DSAT practice papers, October SAT answers, SAT Reading and Writing, SAT Math, SAT question analysis, allsatpapers.com

Last updated: October 2026. All test content referenced under fair use for educational analysis. SAT® is a registered trademark of the College Board, which was not involved in the production of, and does not endorse, this analysis or any products offered on this site.