# SAT Algebra: the largest Math domain, worked item by item

Algebra is about 35% of the Digital SAT Math section, 13 to 15 questions. The five skill points College Board names, three worked items you can attempt, and the slips that cost marks.

## The short answer

Algebra is the largest Math domain on the Digital SAT, tied with Advanced Math at about 35% of the section. That works out to 13 to 15 of the 40 operational Math questions. The items cover linear equations in one and two variables, linear functions, systems of two linear equations, and linear inequalities. Some are multiple choice and some ask you to type your own answer.

## Key facts

- **Section:** Math
- **Domain:** Algebra
- **Domain share:** ~=35% of the section, 13-15 questions
- **Question format:** Multiple choice and student-produced response
- **Skill points in this domain:** 5, all of them linear
- **Math section:** 44 questions, 40 operational, 70 minutes

Question counts, timings and domain shares come from College Board's test pages and the Digital SAT Suite Specifications Overview, checked 28 September 2026.

## How it's scored

One mark per question. Algebra items appear in both Math modules, and within a module the questions run easiest to hardest. A late Algebra item is rarely harder algebra. It is usually the same algebra with one more step in front of it.

College Board names five skill and knowledge testing points in this domain:

- Linear equations in one variable
- Linear equations in two variables
- Linear functions
- Systems of two linear equations in two variables
- Linear inequalities in one or two variables

Nothing in the list is nonlinear. A square, a curve or an exponent moves the item into Advanced Math, which is a separate domain of the same size.

> Before you solve, underline what the question asks for. Plenty of Algebra items hand you x and then ask for 2x, for x plus 3, or for the other variable.

## Algebra examples

Worked examples written for this page. Answer each one before you open the model response: memorizing a response is scored as an irrelevant answer in the real test.

**Example 1 -- distribute before you move anything**

Prompt: Solve 5(x - 3) = 2x + 9. What is the value of x?

- A. 4
- B. 6
- C. 8
- D. 12
Answer: C.

Model response: C, 8. Distribute the 5 across both terms: 5x - 15 = 2x + 9. Subtract 2x from each side to get 3x - 15 = 9, then add 15 to get 3x = 24, so x = 8. Check it: 5(8 - 3) = 25 and 2(8) + 9 = 25.

Why it scores: Option A is what you get by multiplying only the first term, which turns the left side into 5x - 3 and gives x = 4. Substituting your answer back takes ten seconds and catches that slip every time.

**Example 2 -- the question does not ask for x**

Prompt: A system of equations is given by 2x + y = 11 and x - y = 1. What is the value of x + y? Type your answer.

Write your response.

Model response: 7. Add the two equations so that y cancels: 3x = 12, so x = 4. Put x = 4 into x - y = 1 to get y = 3. The question asks for x + y, which is 4 + 3 = 7. Check both equations: 2(4) + 3 = 11 and 4 - 3 = 1.

Why it scores: Solving the system is the easy half. The mark goes to whoever notices that neither 4 nor 3 is the answer. This is a typed response, so no list of options warns you.

**Example 3 -- a word problem that hides an inequality**

Prompt: A van can carry at most 1,200 pounds. It already holds 340 pounds of tools. Each crate weighs 55 pounds. What is the greatest number of crates the van can carry?

- A. 14
- B. 15
- C. 16
- D. 21
Answer: B.

Model response: B, 15. The tools use 340 pounds, so the crates can weigh 1,200 - 340 = 860 pounds. Dividing, 860 / 55 is about 15.6, and you cannot load part of a crate, so the answer is 15. Check: 15 crates weigh 825 pounds, and 825 + 340 = 1,165, which is under the limit. Sixteen crates weigh 880 pounds, and 880 + 340 = 1,220, which is over it.

Why it scores: Option D comes from dividing 1,200 by 55 and forgetting the tools. The setup is the hard part here, and rounding is the second trap. An inequality with a whole-number answer rounds down, never to the nearest whole number.

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## Common mistakes

| What costs marks | Do this instead |
| --- | --- |
| Distributing a coefficient across only the first term inside the parentheses. | Write the expanded line out in full before you move anything across the equals sign, then substitute your answer back. |
| Solving for x when the question asks for x + 3, for 2x, or for the second variable. | Circle the quantity the question names. On typed responses there are no options to catch you. |
| Turning a word problem into an equation when it is really an inequality. | Watch for "at most", "no more than" and "at least". Those phrases set a limit, so the answer is a boundary rather than an exact match. |
| Rounding an inequality answer to the nearest whole number. | A count that has to stay under a limit rounds down. 15.6 crates means 15 crates, not 16. |

**Turn correct answers into a score** The SAT score calculator maps correct answers per module onto a 400-1600 range with College Board's own table, and superscores across test dates. [Open the SAT score calculator](/sat/score-calculator)

## How to practice

1. Take ten linear equations and solve each one twice: once normally, once by substituting your answer back. The second pass is the habit you want under time pressure.
2. Rewrite every word problem as an equation or inequality before you calculate anything. Marking only the setup is faster than solving, and setup is where the marks go.
3. Keep a list of the questions you got wrong because of what they asked for rather than how to solve them. That list is usually longer than people expect.
4. Practice systems both ways, by elimination and by substitution, and time both. One is clearly faster for most pairs, and knowing which saves a minute per item.

## Common questions

### How many Algebra questions are on the SAT Math section?

About 13 to 15 of the 40 operational Math questions, which College Board puts at roughly 35% of the section. The Math section has 44 questions in total across its two modules.

### Are SAT Algebra questions multiple choice?

Some are. The Math section uses multiple choice and student-produced response, where you type your answer instead of picking one of four options.

### Is Algebra the biggest domain on the SAT Math section?

It is tied for biggest. Algebra and Advanced Math are each about 35% of the section, so together they account for roughly 70% of the operational Math questions.

**Sources**
- [College Board: what's on the SAT Math section (checked 28 September 2026)](https://satsuite.collegeboard.org/sat/whats-on-the-test/math)
- [College Board: Digital SAT Suite of Assessments Specifications Overview (PDF)](https://satsuite.collegeboard.org/media/pdf/digital-sat-test-spec-overview.pdf)
- [College Board: how SAT scores are calculated (checked 28 September 2026)](https://satsuite.collegeboard.org/sat/scores/understanding-scores/how-scores-are-calculated)

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