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Quick answer or second look? The Cognitive Reflection Test is seven short puzzles, each with an answer that springs to mind fast but is wrong. It takes about two minutes and shows how often you stopped to check, with a worked solution for every puzzle.
Scientific background: Frederick, S. (2005). Cognitive reflection and decision making. Journal of Economic Perspectives, 19(4), 25–42. Toplak, M. E., West, R. F., & Stanovich, K. E. (2014). Assessing miserly information processing: An expansion of the Cognitive Reflection Test. Thinking & Reasoning, 20(2), 147–168. Four-option multiple-choice version (CRT MCQ-4): Sirota, M., & Juanchich, M. (2018). Effect of response format on cognitive reflection: Validating a two- and four-option multiple choice question version of the Cognitive Reflection Test. Behavior Research Methods, 50(6), 2511–2522. https://doi.org/10.3758/s13428-018-1029-4. Materials: https://osf.io/mzhyc/, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Changes: Traditional Chinese translation by Treehole Hong Kong (樹洞香港自行翻譯，未經心理計量驗證); puzzles and answer options shown in a fixed order instead of randomised; web instruction adapted. The authors do not endorse this site. Learn more
This is a thinking puzzle for self-understanding, not an intelligence or clinical test. Items from Frederick (2005) and Toplak, West & Stanovich (2014); multiple-choice version by Sirota & Juanchich (2018), used under the Creative Commons Attribution 4.0 licence. Chinese translation by Treehole Hong Kong, not psychometrically validated.
Cognitive Reflection Test (CRT-7)
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You will see several puzzles that vary in difficulty. Answer as many as you can. Choose one answer for each puzzle; there is no time limit.
A bat and a ball cost £1.10 in total. The bat costs £1.00 more than the ball. How much does the ball cost?
If it takes 5 machines 5 minutes to make 5 widgets, how long would it take 100 machines to make 100 widgets?
In a lake, there is a patch of lily pads. Every day, the patch doubles in size. If it takes 48 days for the patch to cover the entire lake, how long would it take for the patch to cover half of the lake?
If John can drink one barrel of water in 6 days, and Mary can drink one barrel of water in 12 days, how long would it take them to drink one barrel of water together?
Jerry received both the 15th highest and the 15th lowest mark in the class. How many students are in the class?
A man buys a pig for £60, sells it for £70, buys it back for £80, and sells it finally for £90. How much has he made?
Simon decided to invest £8,000 in the stock market one day early in 2008. Six months after he invested, on July 17, the stocks he had purchased were down 50%. Fortunately for Simon, from July 17 to October 17, the stocks he had purchased went up 75%. At this point, Simon:
Complete the assessment to open your report.
Results are for reference only and do not constitute a medical diagnosis — if you have concerns, please consult a doctor or mental-health professional.
