Critical Thinking Worksheets (Free Printable PDFs)

Free printable critical thinking worksheets with answer keys — ready to print or save as a PDF. Each worksheet targets a specific reasoning skill and comes with a full solution sheet.

By The TrainThinking Team · Educators & reasoning-assessment specialists · Updated June 17, 2026

Four free, print-ready critical thinking worksheets — one per core skill — each with a full answer key. Work through them on screen or hit Print and choose "Save as PDF" for a clean copy (only the worksheets print, not the site). For an interactive, auto-scored version, take the free critical thinking test.

Assumptions

Worksheet 1 — Spot the Assumption

For each statement, write the unstated assumption it depends on.

  1. "We should advertise on the radio to reach the most customers."
  2. "Hire Sam — he went to a top university, so he'll do great work."
  3. "Lower the price and we'll sell more units."
  4. "Ban phones in class and grades will improve."
  5. "Add solar panels and our energy bill will drop."
Show answer key
  1. A meaningful share of target customers actually listen to the radio.
  2. A top-university background reliably predicts strong job performance.
  3. Demand for the product responds to price (customers are price-sensitive).
  4. Phones are currently having a negative effect on grades.
  5. The location gets enough sunlight for the panels to generate useful power.
Inference

Worksheet 2 — Reasonable or Not?

Read each fact, then decide whether the inference is reasonable, and explain why.

  1. Fact: A shop sold out of umbrellas on 9 of the 10 rainiest days. Inference: "Rain increased umbrella sales."
  2. Fact: 312 of 400 staff prefer home working. Inference: "The company will change its policy."
  3. Fact: A class that slept 8+ hours scored higher on a test. Inference: "Sleeping 8 hours guarantees a high score for anyone."
  4. Fact: A café sold out of pastries before noon on 26 of 30 days. Inference: "Demand often exceeded supply."
Show answer key
  1. Reasonable (probable): the strong pattern points to rain driving sales, though it is not absolute proof.
  2. Not supported: staff preference says nothing about what management will decide.
  3. Not supported: a group average does not guarantee an individual outcome, and "guarantees" overstates it.
  4. Reasonable: selling out early on most days shows supply fell short of demand.
Deduction

Worksheet 3 — Does It Follow?

Decide whether each conclusion necessarily follows from the premises.

  1. All safety-team members are first-aid trained. Priya is not trained. Conclusion: Priya is not on the safety team.
  2. If it rains, the match is cancelled. It did not rain. Conclusion: the match went ahead.
  3. No reptiles are mammals. All snakes are reptiles. Conclusion: no snakes are mammals.
  4. All cats here are vaccinated. Max is vaccinated. Conclusion: Max is a cat here.
Show answer key
  1. Follows — anything lacking the required training cannot be a member (valid).
  2. Does not follow — the match could be cancelled for another reason (denying the antecedent).
  3. Follows — necessarily true from the two premises.
  4. Does not follow — many vaccinated animals are not these cats (affirming the consequent).
Arguments

Worksheet 4 — Strong or Weak Argument?

For each, decide whether the argument is strong or weak, and say why.

  1. Should restaurants post hygiene grades? "Yes — visible grades let customers choose and push standards up."
  2. Should tests be optional for admission? "No — tests have always been required."
  3. Should the office try a 4-day week? "Yes — a trial at a similar firm cut sick days 30% with flat output."
  4. Should the town fluoridate water? "No — adding any chemical sounds unnatural to me."
Show answer key
  1. Strong — relevant and gives a concrete benefit (informed choice + incentive).
  2. Weak — appeal to tradition; gives no reason the requirement is actually better.
  3. Strong — relevant, evidence-based benefits tied directly to the proposal.
  4. Weak — a feeling about "unnatural", not evidence about safety or benefit.

How to use these worksheets

Have learners commit an answer in writing before revealing the key — the act of committing is what builds the skill. They suit upper-primary through adult learners and work as warm-ups, homework, or discussion starters. Teachers are welcome to print and share them for classroom use.

More practice

For worked walk-throughs, see the critical thinking exercises; for discussion prompts, the critical thinking questions bank; and to measure progress, the test.

Frequently asked questions

Are these critical thinking worksheets free?

Yes. Every worksheet on this page is free to use, print, and share for classroom or personal use, and each comes with an answer key.

How do I download the worksheets as a PDF?

Use the print button (or your browser's Print dialog) and choose "Save as PDF" as the destination. The page is formatted so only the worksheet — not the site navigation — appears in the printout.

What grade levels are these worksheets for?

The scenarios are self-contained and need no prior subject knowledge, so they suit upper-primary through adult learners. Teachers can use them as warm-ups, homework, or discussion starters.

Related

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