Careful Thinking
The math here is pretty simple, but most people’s first thought is that the ball costs $0.10. This puzzle teaches us that our fast thinking is not always very accurate. If we want to come to the correct answer, it’s a good idea to think about things slowly and carefully whenever possible.
More Puzzles
Courses
![](https://critikid.com/.netlify/images/?url=c%2Ffallacy-detectors-1.png&w=96&h=96&fit=contain)
Fallacy Detectors Part 1
Develop the skills to tackle logical fallacies through a series of 10 science-fiction videos with activities. Recommended for ages 8 and up.
![](https://critikid.com/.netlify/images/?url=c%2Fstatistical-odyssey.png&w=96&h=96&fit=contain)
A Statistical Odyssey
Learn about common statistical misconceptions with an interactive space adventure. Recommended for ages 12 and up.
![](https://critikid.com/.netlify/images/?url=c%2Fformal-logic.png&w=96&h=96&fit=contain)
Symbolic Logic for Teens Part 1
Learn how to make sense of complicated arguments with 14 video lessons and activities. Recommended for ages 13 and up.
Worksheets
![Symbolic Logic Worksheets icon](https://critikid.com/.netlify/images/?url=w%2Fsymbolic-logic.png&w=96&h=96&fit=contain)
Symbolic Logic Worksheets
Worksheets covering the basics of symbolic logic for children ages 12 and up.
![Elementary School Worksheets and Lesson Plans icon](https://critikid.com/.netlify/images/?url=w%2Fbct-elementary.png&w=96&h=96&fit=contain)
Elementary School Worksheets and Lesson Plans
These lesson plans and worksheets teach students in grades 2-5 about superstitions, different perspectives, facts and opinions, the false dilemma fallacy, and probability.
![Middle School Worksheets and Lesson Plans icon](https://critikid.com/.netlify/images/?url=w%2Fbct-middle.png&w=96&h=96&fit=contain)
Middle School Worksheets and Lesson Plans
These lesson plans and worksheets teach students in grades 5-8 about false memories, confirmation bias, Occam's razor, the strawman fallacy, and pareidolia.
![High School Worksheets and Lesson Plans icon](https://critikid.com/.netlify/images/?url=w%2Fbct-high.png&w=96&h=96&fit=contain)
High School Worksheets and Lesson Plans
These lesson plans and worksheets teach students in grades 8-12 about critical thinking, the appeal to nature fallacy, correlation versus causation, the placebo effect, and weasel words.
![Statistical Shenanigans Worksheets and Lesson Plans icon](https://critikid.com/.netlify/images/?url=w%2Fbct-statistics.png&w=96&h=96&fit=contain)
Statistical Shenanigans Worksheets and Lesson Plans
These lesson plans and worksheets teach students in grades 9 and up the statistical principles they need to analyze data rationally.