Digital SAT October 2026 10I — Cross-Text Agreement, Controlled Comparisons, and Algebra

Last updated: October 2026 · By the AllSatPapers Content Team

October 2026 Digital SAT Form 10I is a useful companion to 10C because two sample families visibly recur with changed details. The blood-chemistry passage changes its towns and answer order; a rectangle changes its dimensions and area. A separate similarity question tests whether a student incorrectly applies a side-length scale factor to angles.

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What’s Inside the 10I File?

The US-labeled 102-page file contains 98 numbered question pages and four key pages. Its practice value comes from keeping the target clear: the vocabulary task asks for the novelty of a research direction, the triangle asks for a corresponding angle, and the rectangle asks for a physically valid width. The same method can transfer without the same final number.

Source and key notes: The selected answers agree with the printed key. A complete count of question pages does not certify every answer. The filename supplies the US/October label; the PDF itself does not independently establish an individual test administration.

Reading and Writing: compare claims at the right level

M1 Q1 (p.1) calls a research approach innovative, while Q3 (p.3) asks for “forecast” in a discussion of collectibles. Both depend on the example that follows the claim. Q6 (p.6) asks for the structure of a city-definition passage: a question opens the text, and differing criteria explain why it has multiple answers. These are not tests of whether the student already knows the research, market, or cities. The relevant evidence is the relationship between the sentences supplied.

M2 Q7 (p.35) concerns an experiment, and Q12 (p.40) compares two perspectives on the Iowa Writers’ Workshop. The authors disagree about whether the program promotes uniformity, yet they can agree that a particular novel uses conventional narrative structure. Q15 (p.43) asks for a male–female bear comparison at the same age; Q17 (p.45) involves green-hydrogen land data. In both, the comparison must hold the appropriate condition fixed. Q22 (p.50) turns to punctuation around a musical mashup. The section therefore rewards flexibility: sometimes the answer is an overlap between claims, sometimes a controlled numerical comparison, and sometimes a grammatical boundary. Name that operation before choosing an answer.

Math: a changing target changes the efficient method

M1 Q1 (p.57) is direct function evaluation, Q3 (p.59) uses corresponding angles in similar triangles, and Q13 (p.69) combines polynomial terms. Q14 (p.70) converts rectangle dimensions into an area equation. These questions are efficient when the representation is kept simple: substitute once, map vertices explicitly, distribute a negative sign across the whole parenthesis, or multiply the two dimension expressions. A long calculation is not a sign of a stronger solution.

M1 Q18 (p.74) asks when an equation is an identity. The x coefficient and constant must both agree. M2 Q16 (p.95) uses perpendicular-line information, while Q20 (p.99) asks about a trigonometric relationship and Q21 (p.100) requests a sum of scaled coefficients. In that last problem, x=1 reveals the sum much faster than full expansion. The target matters as much as the topic: an expression involving squares may ask for a coefficient sum rather than its roots, and similar figures may ask for an invariant angle rather than a scaled length. Keep the requested quantity visible throughout the solution and check it again before entering the result.

Sample Questions — Answers and Reasoning

Reading & Writing M1 Q1 — The answer word survives the retune

Source excerpt, PDF p.1: “have instead chosen the ______ path”

Included key: C, “innovative” (p.28). The researchers turn from the customary focus on people above sea level to people below it, here in Niland and Imperial. “Innovative” describes that departure. Form 10C uses Westmorland and Indio and places the same answer word at B. The comparison demonstrates why the contrast in the sentence matters more than the name of the town or the position of the option.

The researchers’ use of locations at different elevations supports the idea of an inventive approach. Compare each candidate with what the researchers actually do, not with whether the word sounds positive. A vocabulary answer needs the correct relationship to the evidence, not merely a favorable tone.

Math M1 Q3 — Similar triangles preserve angles

Source excerpt, PDF p.59: “The measure of angle B is 33° and AB/4 = DE.”

Included key: 33 (p.79); calculation checked by our team. The correspondence is A to D, B to E, and C to F, so angle E equals angle B: 33 degrees. The equation AB/4 = DE gives a side-length scale factor, but similar figures keep corresponding angles equal. Dividing the angle by four would apply a length relationship to the wrong kind of quantity. Mark the corresponding vertices before doing any arithmetic.

The stated vertex correspondence is the shortest route. Similar triangles preserve corresponding angle measures even when their side lengths change. Record B↔E before calculating anything. Multiplying 33° by a length scale factor would apply the right information to the wrong kind of quantity.

Math M1 Q14 — A second rectangle, a different root

Source excerpt, PDF p.70: “a width of n yards and a length of (n + 8) yards”

Included key: 11 (p.79); calculation checked by our team. With area 209, write n(n + 8) = 209. Then n² + 8n − 209 = (n + 19)(n − 11) = 0. The negative solution is not a physical width, leaving n = 11 and length 19. Check 11 × 19 = 209. The structure resembles 10C’s rectangle, but carrying over its answer 12 would fail the area check.

Expand the area equation as n²+8n−209=0, then factor (n+19)(n−11)=0. The physical width is 11, and the length is 19. Checking 11×19=209 confirms both the algebra and the contextual selection. The rejected root is invalid because a rectangle cannot have a negative width.

Reading & Writing M2 Q12 — Agreement can survive a larger disagreement

Source: PDF p.40. Included key: C (p.56).

Text 1 presents The Twelve Tribes of Hattie as an example of conventional narrative structure among Iowa Writers’ Workshop graduates. Text 2 argues against the broader uniformity claim by contrasting Hattie with Justin Torres’s unconventional Blackouts. The second author can reject the generalization while accepting the first author’s description of Hattie. C captures that shared point: Hattie relies on a conventional narrative approach.

A goes further by comparing Hattie with the work of most other graduates, a claim neither passage establishes together. B invents an influence from Mathis to Torres. D turns the novel’s success into a cause of institutional change. Those choices transform a descriptive agreement into an unsupported comparison or causal story.

For cross-text agreement, separate the authors’ local observations from their broader conclusions. Draw one box for the shared description of Hattie and another for the disputed claim about the program. The question targets the first. This method prevents the common mistake of assuming that authors who disagree overall cannot agree about a piece of evidence.

Math M2 Q21 — Evaluate once, then restore the scale

Source: PDF p.100. Included key: −48 (p.102); algebra checked independently.

The expression is P(x)=−12(5x−3)²+4(5x−2)², and it equals (a/4)x²+(b/4)x+c/4. At x=1, the right side becomes (a+b+c)/4. The left side becomes −12(2²)+4(3²)=−48+36=−12. Therefore a+b+c=4(−12)=−48.

The tempting −12 is the polynomial’s value at 1, not the requested coefficient sum. The denominator of 4 is part of the problem and must be undone. Evaluating at zero would give only the constant term; evaluating at one is useful precisely because every power of one is one.

For an independent check, expansion gives −200x²+280x−92. Multiplying these coefficients by 4 gives a=−800, b=1120, and c=−368, whose sum is −48. The direct evaluation is shorter and less exposed to sign errors, while expansion is a useful verification when you have time. In particular, distribute each leading coefficient to the middle term as well as the squared and constant terms.

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 9H, R&W Module 1, Q22, PDF p.22 → 10I, R&W Module 2, Q15, PDF p.43

Retuned task. September’s bear table asks for the largest displayed weight, while October asks for evidence comparing sexes at the same age. October’s female bear 319 and male bear 150 are both age 10. The table’s topic is familiar, but the requested operation changes from finding a maximum to controlling a comparison. Before scanning the weights, identify the age constraint. A pair with a larger contrast can still be invalid if the ages differ.

2. 2025 12F, R&W Module 2, Q57, archived record p.157 → 10I, R&W Module 1, Q6, PDF p.6

Same-family retune. The earlier city-definition passage uses Albania and Greece, while October uses Iceland and Greece and changes one nonpopulation criterion. The rhetorical structure stays a question followed by an explanation of multiple possible answers. Neither passage is organized as a recommendation or a count of cities. Treat the countries and thresholds as examples within the text; the task is to describe organization, not to establish current legal definitions.

3. 2025 9J, R&W Module 2, Q56, archived record p.98 → 10I, R&W Module 1, Q3, PDF p.3

Same-family retune. The earlier bank discusses vintage movie posters; October discusses Barbie dolls. Both use an unexpected price surge to explain why the market is difficult to forecast. The concrete collectible changes, but the clue “would have predicted” remains decisive. A monitoring answer would describe tracking activity rather than anticipating it. This is a useful transfer pair because the method should survive the changed example while the option order must still be checked.

4. 2025 10A, Math Module 1, Q2, archived record p.60 → 10I, Math Module 1, Q1, PDF p.57

Skill analogue. The archived evaluation question and October’s f(x)=145x+30 both supply an input and ask for an output. Their expressions differ, so this is a substitution analogue rather than a repeat. October gives f(6)=900. Write the full substitution before calculating; doing so preserves the distinction between multiplying the input and adding the constant. A familiar function-question sentence alone says nothing about whether the earlier numerical answer applies.

5. 2026 6B, Math Module 1, Q13, PDF p.97 → 10I, Math Module 1, Q13, PDF p.69

Skill analogue. June’s subtraction of cubic expressions and October’s subtraction of quadratics both require distributing a minus sign across the entire second parenthesis. October becomes 2x²−6x, so k=6. The degree and coefficients differ, but the error pattern is the same: changing only the first term’s sign corrupts the result. Underline the outer minus before combining like terms. The comparison is about a sign-handling skill, not an identical expression.

6. 2025 10B, Math Module 2, Q9, archived record p.86 → 10I, Math Module 1, Q18, PDF p.74

Same-family retune. The earlier identity matches constants after terms are expanded; October’s 13x+351=a(x+27) puts the parameter in the coefficient and constant simultaneously. Setting a=13 makes both parts agree. An equation with infinitely many solutions must hold for every x, not just one convenient input. Use coefficient matching and then check the constant term. A single successful numerical substitution would be weaker evidence than an identity established algebraically.

Tips for Students Using 10I

• Match an answer word to the passage before remembering its letter.
• Write the vertex correspondence explicitly for similar figures.
• Apply scale factors to lengths, not corresponding angles.
• Reject negative roots only after using the geometric meaning of the variable.
• After solving the 10C and 10I rectangles, explain which coefficients changed and why.

A Focused Review Sequence

Practise this form in pairs of questions that look similar but ask for different targets. Compare the heaviest-bear task from September with October’s same-age comparison, then compare finding roots with finding a coefficient sum. For each, write the exact requested quantity in five words or fewer. On cross-text reading, identify one shared observation before evaluating the larger disagreement. On Math, preserve scale factors and context restrictions through the final line. These habits make the efficient methods reliable instead of turning them into shortcuts applied by resemblance alone.

As a final check on the coefficient-sum shortcut, explain why x=1 collects every coefficient while x=0 isolates only the constant. The input is chosen to match the requested expression; it is not a rule for every polynomial question. That explanation tests whether you can adapt the method when a later question asks for a different combination.

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 10I 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 10I, 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.