Reading and Writing · Information and Ideas

SAT Command of Evidence (Quantitative): The Complete Guide

Q: How many quantitative evidence questions are on the digital SAT?

Expect roughly 2 to 4 per test across the Reading and Writing section. The exact number varies by test.

Q: Do I need a calculator for SAT quantitative evidence questions?

These questions are in the Reading and Writing section, which does not have the built-in calculator. They need only simple comparisons, subtraction, or dividing round numbers by hand.

Q: What is the difference between a count and a rate in SAT data questions?

A count is the raw number of cases; a rate or percent compares that number to a total. A group can have the most cases and still not be the most likely group.

Q: How do I know which answer is relevant?

Re-read the passage’s claim and the end of the stem. The correct choice supports that exact claim; a true statement about different data features is a distractor.

Q: What is the fastest way to read an SAT graph?

Read the title, axis labels, units, and legend first, then find only the values the claim needs. Skipping the labels is the most common cause of mistakes.

Quantitative evidence questions give you a short text and a table or graph, then ask which choice accurately uses the data to complete or support a statement. They test careful reading of labels, units, and comparisons more than math. This guide shows you how to read a figure in the right order and how to catch the near-miss choices that misstate a number or answer a slightly different question.

Section: Reading and Writing
Domain: Information and Ideas (about 26% of the section)
Questions per test: Roughly 2–4
Math needed: Comparison and simple subtraction, no calculator required

What Command of Evidence: Quantitative tests

Each question has a short passage, a table or graph, and a stem that asks you to complete or support a statement with data. You might see “Which choice most effectively uses data from the table to complete the statement?” or “Which choice best describes data from the graph that support the claim?”

The text sets up a claim, topic, or goal. The figure supplies the data. Your job is to choose the answer that is both accurate (the numbers and comparisons it states are true to the figure) and relevant (it actually supports what the passage is trying to say). A choice that fails either test is wrong.

Because many wrong choices are accurate but irrelevant, you need to treat the passage as seriously as the figure. A true statement about the data does not help if it answers a question nobody asked.

The method at a glance: figure first, then claim, then check

Spend five seconds on the figure before reading the claim: title, axes or column headings, units, and the number of series. Then read the passage and the stem to find exactly what has to be shown. Predict what the data would have to look like, then check each choice against the figure, one number at a time.

Read the title, headings, units, and legend.
Read the passage and stem. What claim must the data support?
Predict the kind of comparison needed (highest, change over time, rate versus total).
Check every choice against the figure, number by number.
Among accurate choices, pick the one that addresses the claim.

Core concepts: reading data precisely

Data comparisons you need to handle
Idea	What it means	Common slip
Count versus rate	A count is a raw number; a rate or percent compares to a total	Treating the largest count as the highest rate
Percent versus percentage points	A rise from 12% to 18% is 6 percentage points (50% relative growth)	Calling a 6-point rise “6 percent”
Change over time	Compare the end value to the start value, and note direction	Reading the wrong year or ignoring a dip in between
Highest or lowest	Compare every row or bar, not just the first few	Missing a close second
Scale and axes	Check where each axis starts and its units	Misreading a truncated axis as a larger gap

Words that signal comparison types. “Greater than” and “less than” ask for a direct comparison of two values. “Increased” and “decreased” ask for change over time. “Most likely” or “highest rate” points to a percent or ratio. “The most” or “the largest number” points to a count.

Trends versus single points. If a claim says a quantity grew, every interval in the claim must grow. If it says a quantity grew fastest, you must compare the sizes of the changes, not just the final values.

Step-by-step method

Scan the figure. Note the title, axes or headings, units, and every series.
Read the passage and stem. Identify the claim or the sentence you have to finish, including the blank’s grammar and logic.
Decide what comparison is needed. Highest? Change? Share? Rate?
Pull the relevant numbers yourself. Write two or three values down so you are not relying on memory.
Test each choice. Check every number and every comparative word (higher, lower, doubled, nearly).
Eliminate choices that are inaccurate, then those that are irrelevant. The one left should be both accurate and on-claim.

If the figure is a graph, estimate values only as precisely as you need to. When two choices differ by a small amount, the SAT generally makes the figure clear enough to distinguish them. If you are splitting hairs, you are probably reading the wrong feature.

Worked examples

Worked example

Example 1 (easy): completing a statement with table data

An ecologist counted bird species at three wetland sites in spring and again in fall. The restored marsh had the highest species count of the three sites in spring, and ______

Bird species counted at three wetland sites
Site	Spring count	Fall count
Restored marsh	41	38
Reference marsh	35	39
Drained marsh	22	19

Which choice most effectively uses data from the table to complete the statement?

Athe restored marsh also had the highest count in fall.
Bthe reference marsh had the highest count in fall.
Cthe drained marsh’s count rose from spring to fall.
Dthe counts at all three sites fell from spring to fall.

Show the solution

The blank has to follow a statement about spring being highest for the restored marsh (41, true). The completion should tell us something about fall.
Choice A is the tempting one: the restored marsh led in spring, so it is easy to assume it led in fall. But its fall count is 38, below the reference marsh’s 39.
Choice C says the drained marsh rose. It went from 22 to 19, which is a decrease.
Choice D says all three fell. The reference marsh rose from 35 to 39, so D is false.
Choice B states that the reference marsh had the highest fall count. 39 is greater than 38 and 19, so it is accurate and relevant to the passage’s comparison of sites.

Answer: B

Worked example

Example 2 (medium): supporting a claim about a trend

A city’s sustainability office tracks the percent of households that take part in curbside composting. The office claims that participation has not only grown every two years but has grown by a larger amount in each successive two-year period.

Households participating in curbside composting

Which choice most effectively uses data from the graph to support the office’s claim?

AParticipation rose by 6 percentage points from 2016 to 2018, by 9 from 2018 to 2020, and by 10 from 2020 to 2022.
BParticipation in 2022 was 37 percent, more than three times the 12 percent recorded in 2016.
CParticipation rose by 10 percentage points from 2016 to 2018, by 9 from 2018 to 2020, and by 6 from 2020 to 2022.
DParticipation rose by the same number of percentage points in each two-year period from 2016 to 2022.

Show the solution

The claim has two parts: participation rose each period, and each rise was bigger than the last. We need the sizes of the three changes: 18 − 12 = 6, 27 − 18 = 9, 37 − 27 = 10.
Because 6 < 9 < 10, the increases are getting larger each period, which is exactly the claim.
Choice B is true (37 is more than three times 12) and is the tempting one, but it compares only two endpoints. It says nothing about whether each interval grew by more than the last, so it is irrelevant to the “larger in each period” part.
Choice C lists the right numbers in reverse order, which would show shrinking increases and contradict the data.
Choice D is false because the three changes are different.
Choice A states the three changes correctly and in order, so it matches the data and the claim.

Answer: A

Worked example

Example 3 (hard): rate versus count in a table

A museum surveyed visitors in three age groups about whether they used the audio guide. The museum’s director said that visitors ages 55 and older were the age group most likely to use an audio guide, ______

Museum survey results by age group
Age group	Visitors surveyed	Visitors who used an audio guide
18–34	200	90
35–54	250	100
55 and older	150	90

Which choice most effectively uses data from the table to complete the statement?

Abut they accounted for fewer audio guide users (90) than visitors ages 35–54 did (100).
Band they also accounted for the greatest number of audio guide users, with 90.
Cbut visitors ages 18–34 used audio guides at the same rate, 45 percent.
Dbut visitors ages 18–34 were the least likely group to use one, at 45 percent.

Show the solution

Compute the rates, since “most likely” is about rate, not count: 18–34 is 90 ÷ 200 = 45 percent; 35–54 is 100 ÷ 250 = 40 percent; 55 and older is 90 ÷ 150 = 60 percent. The director is right that 55 and older are highest.
The blank should add a relevant comparison. Counts are the natural contrast to a statement about rates: 90, 100, and 90 users.
Choice B claims 90 is the greatest number of users, but 35–54 has 100. False.
Choice C says 18–34 used guides at the same rate as 55 and older. Their rate is 45 percent against 60 percent, so it is false.
Choice D is the subtle one: 18–34 was not the least likely. The 35–54 group, at 40 percent, was lower.
Choice A is accurate (90 versus 100 users) and it supplies the contrast between rate and count that the “but” invites. It is the only choice that is both accurate and relevant.

Answer: A

Common traps and how to beat them

What separates a 700 from a 600

Hard quantitative questions use the same skills with more moving parts. The figure may have several series, the claim may have two components, or the correct choice may require computing a rate yourself.

Multiple conditions. The claim may require two facts at once (for example, highest rate but not highest count). Verify every component, and reject any choice that satisfies only one.
Computed comparisons. You may have to divide, subtract, or compare ratios to see which choice is true. Do the arithmetic briefly and write it down.
Subtle wording. “At least twice as high,” “fewer than a third,” and “nearly equal” each have exact meanings. Test them with the numbers.
Figures with a purpose. The correct choice often matches what the passage is trying to show (for example, that a policy worked), not merely something true about the data.
Close distractors. Two choices may be accurate; the passage’s claim determines which is relevant. Decide relevance by asking which statement the claim would need.

Timing and a practice plan

Most quantitative questions can be done in about 60 seconds if you read the figure first and avoid reading every choice before you know what you need. The extra time for harder ones usually goes to a quick calculation.

Days 1–2: Do 6 table questions. Before reading the choices, write the heading and unit for every column.
Days 3–4: Do 6 graph questions (line, bar, scatter). Practice reading axis labels and units aloud before looking at values.
Days 5–6: Do a timed set of 8 mixed questions. For each wrong answer, label the flaw: wrong label, count versus rate, endpoint, or overreach.
Day 7: Redo your misses. For each, write the sentence the claim would need in order for the wrong choice to have been correct.

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Core concepts: reading data precisely
Step-by-step method
Worked examples
Common traps and how to beat them
What separates a 700 from a 600

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Command of Evidence: Quantitative: FAQ

How many quantitative evidence questions are on the digital SAT?

Expect roughly 2 to 4 per test across the Reading and Writing section. The exact number varies by test.

Do I need a calculator for SAT quantitative evidence questions?

These questions are in the Reading and Writing section, which does not have the built-in calculator. They need only simple comparisons, subtraction, or dividing round numbers by hand.

What is the difference between a count and a rate in SAT data questions?

A count is the raw number of cases; a rate or percent compares that number to a total. A group can have the most cases and still not be the most likely group.

How do I know which answer is relevant?

Re-read the passage’s claim and the end of the stem. The correct choice supports that exact claim; a true statement about different data features is a distractor.

What is the fastest way to read an SAT graph?

Read the title, axis labels, units, and legend first, then find only the values the claim needs. Skipping the labels is the most common cause of mistakes.