How to Teach Critical Thinking Skills in the Elementary Classroom

Children have access to more information than ever before. They can search for an answer in seconds, watch a video explaining almost any topic, or ask an AI tool to solve a problem for them. As access to information becomes easier, an important question for educators is emerging: Do students know what to do with all of that information? This is where critical thinking skills become essential.

Critical thinking is the ability to ask useful questions, examine information, consider evidence, make connections, and use reasoning to reach a conclusion. It also involves recognizing when there is not one obvious answer and being willing to reconsider an idea when new evidence becomes available.

In an elementary classroom, this can happen in very practical ways. Students might decide which material would make the strongest bridge, determine how to spend a limited playground budget, compare different solutions to reduce classroom waste, or use evidence from a story to decide whether a character made a good choice. In each example, students are doing more than remembering what they have learned; they are using their knowledge to make a decision or solve a problem.

Critical thinking does not mean teaching children to question every fact or distrust every source. Instead, students need to learn how to ask sensible questions about information. Where did this information come from? What evidence supports it? Does it make sense based on what I already know? Is there another perspective I should consider? These habits are especially important as students encounter websites, advertisements, social media, search engines, and AI-generated content.

Teachers also do not need to create a separate “critical thinking” subject. Some of the best opportunities already exist within math, science, literacy, social studies, inquiry, and project-based learning. When students investigate meaningful questions and use what they learn to make decisions, critical thinking becomes part of everyday learning. The goal is not simply to teach students what to think. It is to give them the skills and confidence to figure out how to think when the answer is not immediately obvious.

This article will explore practical ways to build critical thinking skills in the elementary classroom through explicit teaching, inquiry-based activities, real-world problems, and meaningful classroom discussions. It will provide teachers with simple strategies to help students evaluate evidence, explain their reasoning, consider different perspectives, and make thoughtful decisions. Some links in this article are affiliate links. Read our full affiliate disclosure here.

Critical Thinking Does Not Mean Questioning Everything

Teaching students to think critically does not mean teaching them to doubt everything they hear. In fact, constantly questioning every fact can make it harder for students to learn. Critical thinking is about knowing when a question needs to be asked and what kind of evidence is needed to answer it.

Imagine a Grade 4 student learning about the solar system. If a trusted science resource explains that Earth orbits the Sun, students do not need to treat that fact as an open debate. They can learn why scientists know this and then use that knowledge to explore more interesting questions. Critical thinking might begin when students are asked, “Why do we experience different seasons?” or “What evidence could we use to explain why the length of daylight changes?”

The same idea applies when students research online. Suppose students are investigating whether their school should stop using disposable plastic water bottles. One website says plastic bottles should be banned immediately, while another discusses situations where bottled water may still be necessary. Critical thinking does not require students to assume that both sources are wrong. Instead, they can ask: Who created this information? What evidence is provided? Are there other reliable sources that support this claim? What perspectives or circumstances might be missing?

This distinction is especially important as children encounter social media, advertising, online videos, and AI-generated information. Students need to recognize that information can be useful without automatically being correct, and that uncertainty does not mean every explanation is equally reasonable. Over time, they will learn to respect reliable evidence and expertise while still asking thoughtful questions when something deserves a closer look. That balance helps create informed, curious learners rather than students who either believe everything they encounter or automatically distrust it.

How to Explicitly Teach and Scaffold Critical Thinking

Critical thinking develops with practice, but teachers should not assume students will automatically know how to do it. At first, teachers can make the thinking process visible by modelling questions, sorting information with students, and explaining why some evidence is more useful than others. As students become more confident, the teacher can gradually step back.

Example #1: Which Material Would Make the Best Rain Shelter?

Scenario: Students are given a simple design challenge: Our class needs a small outdoor shelter for toys. Which material would keep the toys driest? Students are given samples such as cardboard, fabric, aluminum foil, plastic, and paper.

Scaffolding the thinking: Begin by asking students what information they would need before choosing a material. Create a class list that might include whether the material is waterproof, strong, flexible, expensive, colourful, or recyclable. Then ask the important question: Which information actually helps us answer our current problem?

Students may initially argue that colour matters or that aluminum foil “looks stronger.” Rather than correcting them, ask, “Our goal is to keep the toys dry. Does colour help us decide that?” Students can then develop a simple test, collect evidence, compare results, and make a recommendation.

Teacher as guide: Model the difference between a preference and useful evidence. Gradually move from asking the questions yourself to prompting students with, “Which evidence matters most here, and why?”

Hands-on inquiry gets much easier when your classroom already has the basics. A classroom set of kid-sized safety goggles is worth keeping on hand for science experiments, STEM challenges, and student-designed investigations throughout the year.

Example #2: How Should We Spend $500 on Our Classroom?

Scenario: Tell students their class has a fictional $500 budget for improvements. Give them a list of possible purchases, prices, student survey results, and other information. Include some details that are interesting but not necessarily important.

Scaffolding the thinking: First, students identify the actual problem: How can we use $500 to make our classroom better for the most students? Next, have them sort information into categories such as important, possibly useful, and not needed.

For example, knowing that 18 students say the classroom needs more books may be important. Knowing that the blue beanbag chair is the teacher’s favourite colour probably isn’t. Students create two or three possible budgets, compare the advantages of each, and defend their final choice using evidence.

Teacher as guide: Avoid telling students what they should buy. Instead ask, “What information influenced that decision?” “Is that a need or a preference?” and “Which piece of evidence is strongest?” The goal is to help students learn that real decisions require prioritizing information, not simply collecting it.

Example #3: Should We Add More Shade to the Schoolyard?

Scenario: Students investigate whether their schoolyard needs additional shaded areas. Provide photographs, a map of the yard, temperature readings from different locations, student survey results, information about trees and shade structures, and a few unrelated details.

Scaffolding the thinking: Start with a notice and wonder activity. Students examine the information without immediately deciding on a solution. Next, ask them to identify what they need to know to answer the question. A KWL chart is an excellent tool to use here.

Make students’ thinking visible with large sticky chart paper that groups can use for Notice and Wonder activities, evidence sorting, brainstorming, and project planning. Keep the charts posted so students can return to their original thinking and see how their ideas change throughout an inquiry.

Students might decide that playground temperatures, where students spend recess, existing shade, cost, and available space are important. The colour of the playground equipment or number of classroom windows probably is not.

Groups can then develop possible solutions, such as planting trees, installing a shade sail, or changing how outdoor spaces are used. They compare each solution against agreed-upon criteria before making a recommendation.

Teacher as guide: When students become overwhelmed by information, bring them back to the driving question: “Does this information help us answer our question or make our decision?” This simple prompt is an important critical thinking habit. With repeated practice, students begin asking it themselves.

Across all three activities, the teacher’s role gradually changes from modelling the thinking, to prompting the thinking, to letting students manage the thinking themselves. This gradual release helps students develop a process they can eventually transfer to unfamiliar problems without waiting for the teacher to tell them what matters.

How to Embed Critical Thinking Into Everyday Classroom Learning

Critical thinking does not always require a large inquiry project or a special lesson. Teachers can build it into everyday classroom conversations simply by changing the questions they ask. Instead of always asking students to recall the correct answer, give them opportunities to explain why they think something, what evidence supports their thinking, and whether another solution is possible. Using the Think-Pair-Share strategy works well here.

For example, during a read-aloud, a teacher might normally ask, “Why was the character upset?” After students answer, extend the conversation with, “What happened in the story that makes you think that?” Then ask, “Could someone interpret the character’s actions differently?” Students are still discussing the same story, but now they are using evidence and considering another perspective.

The same approach works in math. Suppose students are comparing two strategies for solving a multiplication problem. Rather than showing the preferred method immediately, ask, “Which strategy would you choose? Why?” Students could compare the strategies and explain which is more efficient for that particular problem. The goal is not to make every question more difficult. It is to create regular opportunities for students to explain, compare, justify, and reconsider.

Over time, these prompts can become part of normal classroom language. Teachers may initially need to model the thinking aloud, but eventually students can begin asking these questions themselves.

Applying Critical Thinking in the Elementary Classroom

Activity #1: Which News Story Should We Trust?

Grades: 4–6
Subjects: Language, Social Studies, Digital Literacy
Driving Question: How can we decide which information deserves our trust?

This inquiry helps students practise evaluating information without teaching them to distrust everything they read. The goal is to show students that reliable information usually has recognizable qualities, and that they can use evidence to decide how much confidence to place in a source.

Step 1: Begin With the Same Story Told Different Ways

Choose a safe, age-appropriate current or local topic that students can understand. For example, you might use a story about a new community park, an unusual weather event, a school policy, or an environmental initiative. Provide two or three short sources about the same topic. These might include a local news article, an organization’s webpage, a social media post, or a teacher-created example. Using dry-erase pockets is helpful here as it allows you to reuse the same source in multiple lessons.

Ask students to read the sources without immediately deciding which one is “best.” Have them record what they notice. What information appears in all three, and what is different? What claims are being made?

Step 2: Develop Criteria for Trust

Instead of giving students a checklist immediately, ask, “What would make us more confident that information is reliable?”

Guide the discussion toward practical criteria:

Who created the information?
Why was it created?
Does it provide evidence?
Can important claims be confirmed elsewhere?
Does the author have relevant knowledge or expertise?
Is the source reporting facts, expressing an opinion, or trying to persuade us?

Create a class “Reasons to Trust a Source” chart that students can use during future inquiries.

Step 3: Investigate the Evidence

Groups now return to the sources and look for evidence. Students can highlight claims in one colour and supporting evidence in another. They should also identify information that is interesting but does not actually help answer the driving question.

Teachers can guide the process with prompts such as, “How does that information help you?” or “What evidence supports that claim?”

This is where students practise separating relevant evidence from extra information.

Step 4: Make and Defend a Decision

Groups rank the sources from most to least trustworthy and prepare a short explanation. Importantly, students should not be graded on choosing the teacher’s preferred source. Their reasoning and evidence should matter most.

Students might conclude: “We trust Source B most because the author is identified, it includes information from experts, and we confirmed two of its main claims using another reliable source.”

Step 5: Reflect and Transfer

Finish by presenting students with a new website, headline, video, or social media post. Ask: “What would you do before sharing this or using it in a project?”

The inquiry process used here reflects the broader approach found in the Ontario curriculum, where students gather information, consider credibility and perspective, analyse evidence, draw conclusions, and communicate their findings.

Make claims and evidence easier for elementary students to see with colour-coded highlighters. Students can use one colour for claims and another for supporting evidence, creating a simple visual routine you can reuse in reading, research, and media literacy lessons.

How Could We Make the Trip to School Safer?

Grades: 3–6
Subjects: Math, Social Studies, Health, Language
Driving Question: How could we make travelling to and from our school safer?

This project moves critical thinking beyond a classroom exercise because students investigate a problem connected to their own community. Instead of being given a problem and its solution, students collect evidence, identify patterns, consider different perspectives, and propose realistic improvements.

Step 1: Launch the Inquiry with Observations

Begin with a map or aerial image of the area surrounding the school. Ask students what they notice about roads, sidewalks, intersections, parking areas, bike routes, crosswalks, and entrances. Then introduce the driving question.

Before proposing solutions, students generate questions:

How do students travel to school?
Where do students feel unsafe?
Are some areas busier than others?
Do younger students experience the trip differently?

This keeps students from jumping immediately from problem to solution without evidence.

Step 2: Collect Real Data

Students can create an anonymous class or school survey about transportation methods such as walking, cycling, school buses, public transit, or cars. They can organize the results into tables and graphs.

With appropriate adult supervision and school procedures, students could also conduct an observation from school property. They might count vehicles, bicycles, or pedestrians during a set period or identify locations where congestion occurs. Students now have evidence they can analyse rather than relying only on personal experiences.

Using handheld tally counters (under $10 on Amazon) makes it easy for small groups to count pedestrians, bicycles, vehicles, wildlife, playground use, or almost anything else during an elementary inquiry.

Step 3: Separate Important Information from Interesting Information

This is an excellent opportunity for explicit critical-thinking instruction. Ask students: “Does this information help us understand the safety problem?” For example, the number of students walking to school could be relevant. The most popular colour of students’ bicycles probably is not.

Have students sort their findings into Important Evidence, Possibly Useful, and Not Relevant Yet. Teachers can guide students without doing the sorting for them by repeatedly returning to the driving question.

Step 4: Develop and Compare Solutions

Groups choose one problem supported by their evidence and develop several possible solutions. Depending on their findings, ideas might include a different drop-off procedure, additional bike storage, clearer signs, a walking-school-bus program, or a suggested location for further safety review by appropriate school or municipal officials.

Students then establish criteria such as safety, cost, feasibility, number of people helped, and possible disadvantages. Instead of asking, “Is this a good idea?” ask, “Which solution best meets our criteria?”

Step 5: Present an Evidence-Based Recommendation

Students create a map, infographic, letter, presentation, or short report explaining the problem, their evidence, the solutions considered, and their recommendation. If appropriate, the final work could be shared with the principal, school council, families, or another authentic audience.

This final stage is what gives the project its strength. Students are not simply learning about graphs, maps, communication, or communities. Instead, they are using those skills to investigate a real problem, make a reasoned decision, and propose an action that could improve their community.

Let Students Encounter Productive Disagreement

In an inquiry-based elementary classroom, disagreement should not automatically be treated as something a teacher needs to resolve. When handled respectfully, productive disagreement gives students an opportunity to examine ideas, question assumptions, consider evidence, and revise their thinking. The goal is not to teach students how to win an argument; it is to teach them what to do when another person’s reasoning challenges their own.

This matters because critical thinking requires more than producing an answer. Students need to be able to explain why they believe something, determine whether the available evidence supports it, recognize alternative explanations, and change their conclusions when stronger evidence emerges. Productive disagreement creates a natural reason to practise all of these skills.

Research with primary-aged students supports this approach. Mercer, Wegerif, and Dawes studied 9- and 10-year-old students who were explicitly taught ways of talking and reasoning collaboratively. Students learned ground rules for what the researchers describe as “exploratory talk” – discussion in which ideas can be challenged, reasons are expected, and participants work toward shared understanding. Students not only improved the quality of their collaborative conversations but also improved their individual performance on a non-verbal reasoning assessment. This is particularly relevant to inquiry learning: productive classroom talk can become a tool students use to think, rather than simply a way to report answers.

Furthermore, encountering an opposing position is incredibly valuable. Students who repeatedly participate in dialogic argumentation became better at constructing arguments and show greater awareness of the relationship between evidence and claims. Students develop stronger reasoning when they must genuinely engage with another person’s argument instead of simply stating their own.

For elementary teachers, this means resisting the temptation to immediately step in with the “correct” answer. Imagine two students examining three sources about an environmental issue. One student says, “I think Source 1 is the most trustworthy because it has statistics.” Another responds, “I don’t think those statistics prove what the author says.” That disagreement is an opportunity. Rather than deciding who is right, the teacher can redirect both students toward the evidence: What do the statistics actually show? Where did they come from? Does another source support them

Make productive disagreement easier to guide with our free Teacher Prompts for Critical Thinking PDF. Download the ready-to-use classroom prompts to help students explain their reasoning, evaluate evidence, consider different perspectives, and disagree respectfully.

Over time, these experiences can shift classroom culture from “Who has the right answer?” toward “Which idea is best supported, and why?” Students begin listening for reasoning rather than waiting for their turn to speak. They learn that changing their mind is not losing an argument; it can be evidence that they have evaluated new information thoughtfully. This kind of productive disagreement gives teachers a practical way to make those processes visible during everyday classroom conversations.

How to Assess Critical Thinking

Assessing critical thinking does not have to mean creating a detailed rubric for every inquiry activity. In fact, critical thinking is often easier to see during the learning process than in the polished product students submit at the end.

A beautiful poster does not necessarily demonstrate strong critical thinking. A student who changes their solution after discovering new evidence, explains why one source is more useful than another, or recognizes a weakness in their original idea may be demonstrating much deeper thinking.

For elementary teachers, the key is to focus on a small number of observable thinking behaviours. The Ontario curriculum describes critical thinking and problem solving as locating and processing relevant information, analysing and interpreting it, making informed decisions, and taking action. It also emphasizes applying learning to new situations.

A simple classroom framework can reduce these ideas to five questions:

Look for…	Ask yourself…	What it might sound like from a student
Question	Can the student identify what needs to be figured out?	“We need to know how much waste our class actually produces.”
Evidence	Can the student find and select useful information?	“This survey matters because it tells us how students actually get to school.”
Reason	Can the student explain how evidence supports an idea?	“I think this material is better because it stayed dry in all three tests.”
Reconsider	Can the student compare ideas and revise their thinking?	“I originally chose A, but now I think B would work better because…”
Transfer	Can the student use the thinking in a new situation?	“We could use the same testing process for our next design.”

Teachers do not need to assess all five every time. During one lesson, you might intentionally watch for evidence and reasoning. During another, you might focus on whether students can reconsider and improve an idea.

Use a Quick Observation Checklist

During group work, conferences, experiments, or inquiry activities, carry a class list and record quick observations using a simple three-point scale:

1 = Needs prompting
2 = Developing independently
3 = Demonstrates independently

For example, if today’s focus is evidence, listen for whether students can identify relevant information and use it to support their decisions. A check mark, number, or one-sentence note is often enough. This makes assessment manageable while also helping teachers determine what needs to be explicitly taught next.

Try a 60-Second Critical Thinking Conference

Short conversations can reveal thinking that may not appear in written work. Walk up to a student or group and ask three questions:

1. What are you trying to figure out?
2. What evidence is helping you decide?
3. What could make you change your mind?

These questions work during almost any inquiry, from deciding which material makes the best insulator to evaluating solutions for reducing school waste. The student’s answers give you immediate information about whether they understand the problem, are using evidence, and are willing to reconsider their ideas.

Use Exit Tickets That Assess Thinking, Not Recall

Instead of ending an inquiry lesson with “What did you learn today?”, occasionally use prompts that make students explain their thinking:

The most important evidence we found today was _____ because _____.
One idea I changed my mind about was _____ because _____.
One question we still need to answer is _____.
One piece of information we found that was not very useful was _____ because _____.
Our strongest solution right now is _____ because _____.

These responses are short enough for elementary students but provide much more information about their reasoning than a traditional recall question.

Let Students Assess Their Own Thinking

Critical thinking also involves students becoming aware of how they think. The Ontario transferable-skills framework specifically connects self-directed learning with metacognition, reflection, monitoring progress, and responding to feedback. A simple reflection can use four statements:

I asked useful questions.
I used evidence instead of guessing.
I considered more than one idea.
I changed or improved my thinking when needed.

Students could mark Not Yet, Sometimes, or Consistently and provide one example. The example is important. Instead of simply checking “I used evidence,” ask students to show where they did it.

A Simple Three-Level Assessment Framework

For larger inquiry or PBL tasks, teachers can still use a rubric without making it overwhelming:

Beginning	Developing	Applying
Needs frequent prompts to identify relevant information and explain choices.	Uses relevant information and gives reasons for decisions with some support.	Independently selects useful evidence, compares possibilities, explains decisions, and revises thinking when appropriate.

This framework can be applied to different subjects and projects rather than creating a completely new rubric each time. The most important shift is to assess the thinking, not just the answer. A student’s first solution may fail. Their original claim may turn out to be incorrect. That does not necessarily represent poor critical thinking. Sometimes the strongest evidence of critical thinking is a student saying: “I thought this would work at first, but the evidence showed me something different, so I changed my idea.”

Final Thoughts: Building Critical Thinkers Through Everyday Learning

Critical thinking is not something elementary students develop from a single lesson or project. It grows through repeated opportunities to ask meaningful questions, examine evidence, explain reasoning, consider other perspectives, solve problems, and reflect on their thinking.

Teachers can help by making these skills explicit. Simple changes, such as asking “What makes you think that?” instead of looking only for the correct answer, can turn everyday lessons into opportunities for deeper thinking. Inquiry and project-based learning can take this further by giving students authentic problems where they need to gather information, compare possible solutions, make decisions, and defend their choices.

Just as importantly, critical thinking does not mean teaching students to doubt everything. It means helping them recognize reliable information, listen to other viewpoints, engage in productive disagreement, and be willing to change their thinking when the evidence supports it. You do not need to redesign your entire classroom to get started. Choose one lesson this week and add one opportunity for students to investigate, justify, compare, or reconsider. Small changes to the way we teach, and question students can lead to much bigger changes in the way they think.