Updated August 21, 2026

The 3-Step Method for Data Representation Passages on ACT Science (With Examples)

Bonus Material: Get our comprehensive list of accepted ACT Score Ranges for 2025

Data Representation is one of the 3 passage types on ACT Science. And since you’ll see 2-3 of these passages on the ACT test, knowing strategies to approach it is crucial to getting a good score!

Luckily, there are key strategies to have up your sleeve that will help you save time and gain points. Based on over two decades of preparing students for the ACT, we’ve developed a 3-step method tailored to Data Representation passages on ACT Science.

Plus, we’ve pulled together the latest data on the 25th, 50th, and 75th percentile ACT scores at hundreds of schools in our ACT Score Ranges resource. It’s free and you can grab it below!

Jump to section:
How to Recognize a Data Representation Passage
The 3-Step Method for Data Representation passages
Question Types on Data Representation Passages
Step 1: Skim the passage, but lead with the questions
Step 2: Pinpoint what you’re looking for and where to look for it
Step 3: Use key words to skim the passage for more detail (only when you have to!)
Next Steps

How to Recognize a Data Representation Passage

Hopefully, it’s not a huge shock to learn that Data Representation passages focus on scientific data.

But how can you easily tell a Data Rep passage apart from one of the other two ACT Science passage types?

  • Compared to other ACT Science passages, the text is usually very short.
  • Along with the text, you’ll be given 1-4 tables, graphs, molecular structures, or other figures. These may include some funky types of graphs that you may not have seen before. 

You’ll get 2-3 of the passages across the ACT Science section, out of 7 total passages. The passages can come in any order.

Here’s an example of a typical Data Representation passage:

sample ACT Science Data Representation passage created by PrepMaven, all rights reserved

Now let’s go through the 3-step method for breaking down a Data Representation passage.

The 3-Step Method for Data Representation Passages

When you see a Data Rep passage, here are the steps you should take.

Step 1: Skim the passage, but lead with the questions

Step 2: Pinpoint what you’re looking for and where to look for it

Step 3: Use key words to skim the passage for more detail (only when you have to!)

This is a lot to keep in mind, which is why we’ve put together a guide to everything you need to know about ACT Science – as well as essential strategies to improve your ACT Science score.

Wondering what ACT score you should be aiming for in the first place? You can find all the schools on your college list in our ACT Score Ranges resource to find out what puts you above average.

Now, let’s break down how to apply this method on the ACT.

Question Types on Data Representation passages

Each Data Representation passage will come with a set of 5-6 questions. 

  • Several questions are simply about reading the data in a table, graph, or other figure. That’s it! Here’s an example:
sample ACT Science question created by PrepMaven, all rights reserved

We have a guide all about this question type here if you’re looking for test-taking strategies.

  • A few questions require you to do something with the data. Usually, that means extrapolating data or recognizing patterns, but it can also involve simple calculations. Here’s a typical ACT question of that type:

Based on Table 2, in one mol of any type of alkene, the ratio of hydrogen atoms to carbon answers is always

A. 2:1
B. 1:2
C. 1:1
D. 4:1

We have a post here that’s all about working with data on ACT science.

  • Very few questions – around 1 question on each Data Rep passage – require information from the text. We’ll get into strategies for those below.

These are the questions you’ll see on Data Rep passages. If you want to know all the question types on the whole ACT Science section, we’ve listed those with examples over here.

Now let’s go through applying our step-by-step method to ace all these question types. 

Step 1: Skim the passage, but lead with the questions

When most students see an ACT Science passage, they start at the beginning and read to the end.

If you’re aiming for a high score, don’t do that!

Reading the whole passage costs you valuable time. In our experience, on Data Representation passages, there’s usually just one question for which you really have to read the passage. For the other 4-5 questions, you don’t need details from the passage – skimming is enough.

That’s why some students skip straight to the questions. If you’re not comfortable with that and want to get oriented first, that’s also fine. Skim the passage and circle or underline key words or phrases as you read. Then go to the questions.

As you glance at the questions, start with the ones that just ask for data from figures, like this example.

Take a look at this question:

sample ACT Science question created by PrepMaven, all rights reserved

We’re not even giving you the passage here, because you don’t need it. You don’t need to know what andesite is (or what any of these other minerals are). 

All you need to do is to go straight to the figure:

sample ACT Science Data Representation passage created by PrepMaven, all rights reserved

The only challenging thing about this question is that the figure is complicated and hard to read. That brings up to Step 2.

Step 2: Pinpoint what you’re looking for and where to look for it

We like to say that ACT Science is an open-book test.

Why? Because (almost) all the information you need is right there. The most important skill for ACT Science isn’t memorizing a ton of information – it’s knowing how to find the right information quickly and accurately.

If you’re aiming for a highly competitive – or even perfect – ACT score, mastering this skill will be essential. That’s where a specialist ACT tutor can make a big difference, helping you to learn and practice the key strategies you’ll need.

Back to our example:

sample ACT Science Data Representation passage created by PrepMaven, all rights reserved

First, circle what you need to know in the question. You’re being asked about the composition of andesite, so that’s all we’re interested in for now.

Then, circle the part of the figure that holds that information. Skimming Figure 1, we see andesite in only one place.

sample ACT Science Data Representation passage created by PrepMaven, all rights reserved

Now we’re looking only at the information we need: the part about andesite. That shows us that the biggest components of andesite are amphibole, micas, and plagiocase feldspar – answer choice C.

This strategy also applies to slightly harder questions – the ones where you don’t just have to read the data, you also have to do something with it.

Based on Table 2, in one mol of any type of alkene, the ratio of hydrogen atoms to carbon answers is always

A. 2:1
B. 1:2
C. 1:1
D. 4:1

For this question, we’re still not going to read the passage. But when we go to Table 2, the answer isn’t immediately obvious:

Still, the same strategy applies:

  • What are we looking for? The ratio of hydrogen atoms to carbon atoms.
  • Where do we need to look? The second column. 

We don’t care what MP and BP are for the purposes of this question, so we can just ignore them, along with the names of the molecules.

This question is asking you to recognize a pattern. In the first molecule, the ratio of hydrogen to carbon is 4:2, or 2:1. In the second molecule, it’s 6:3, which is also 2:1.

You can actually stop here. The question tells you that the ratio is always the same, so you don’t need to check every molecule before selecting answer choice A. (Watch out for B – it’s a trap that gives the ratio of carbon to hydrogen, which is the wrong way around!)

If you’re ready to practice, here are 9 of the hardest ACT Science questions out there, along with detailed explanations for each one.

Step 3: Use key words to skim the passage for more detail (only when you have to!)

Around 1 question per Data Representation passage will actually require you to read some of the passage – but only some of it. 

Typically, this type of ACT Science question asks for some detail that’s in the passage. You don’t actually need to read the whole thing carefully.

Instead, start with the question:

A student claimed that echidnas are ectotherms. Which of the following explains why this claim is incorrect? Echidnas are:

A. mammals and primarily generate heat from internal metabolic processes to maintain body temperature.
B. mammals and primarily absorb heat from the surrounding environment to maintain body temperature.
C. reptiles and primarily generate heat from internal metabolic processes to maintain body temperature.
D. reptiles and primarily absorb heat from the surrounding environment to maintain body temperature.

Start by identifying key words in the question and the answer choices. Here, half the difference between the answer choices is about whether these animals are amphibians or reptiles. The key words here are mammal, reptile, and endotherm. 

Now start skimming the passage:

Passage 1:

Short-beaked and long-beaked echidnas (2 species of mammals) behave differently when the species are together in a habitat than when the species are in separate habitats. 

In the very first sentence, you’re handed half of the answer! These animals are mammals, so you can eliminate 2 of the 4 answer choices. And since mammals are “hot-blooded” (they generate heat rather than absorbing heat), you can select answer choice A.

For more practice, you might want to use an ACT prep book (we’ve researched the 11 best ones out there) or, for even better results, work with a specialized test prep tutor. Give us a call to talk about what kind of ACT tutoring would work best for you.   

Next Steps

There you go – now you’re ready to handle any Data Representation passage that comes your way!

The best way to get comfortable with this passage type is to practice the strategies we’ve gone through above. Working with a PrepMaven ACT expert can help you do just this! With one-on-one ACT tutoring, you’ll be well on your way to strategically approaching ACT Science and improving your score. Learn more about our options here, and get in touch with our team for a free consultation.

Related ACT Posts

Ro

Rosamond graduated summa cum laude from Princeton. During college, she worked as a peer tutor for Italian, French, Greek, and academic writing. Since graduation, she’s continued to tutor students of all ages in French, Italian, Latin, English, and math, some of them for several years. She’s currently a graduate student studying the relationship between religion and secular law, and she works as a freelance journalist and translator.

ACT science test prep