Potato Puzzle
Initially, how much water mass did the potatoes have?
99 kg.
Initially, how much dry mass did the potatoes have?
1 kg.
Does dry mass go away with dehydration?
No. (Dehydration is the loss of water.)
Therefore, how many kilograms of dry mass will there be after dehydration?
1 kg. (It doesn’t change.)
After dehydration, what percent of the potatoes are dry mass?
2%. (100%-98%=2%)
If 2% of the weight is 1 kg, what is 100% of the weight?
50 kg. The total weight of potatoes after dehydration is 50 kg.
More Puzzles
You can buy a printable version of these puzzles.
Courses
Fallacy Detectors
Ages 8–12A story-based course that teaches kids to recognize logical fallacies through sci-fi videos and activities.
Social Media Simulator
Ages 9+A mock social media feed where kids practice spotting misinformation and manipulation in a safe environment.
A Statistical Odyssey
Ages 13+An interactive space adventure that teaches teens to spot common errors in data analysis.
Worksheets
Logical Fallacies Worksheets and Lesson Plans
Ages 8–12Teach your grades 3-7 students about ten common logical fallacies with these engaging and easy-to-use lesson plans and worksheets.
A Statistical Odyssey Worksheets and Lesson Plans
Ages 13+Turn A Statistical Odyssey into a complete 14-class unit for homeschool or classroom with these lesson plans, printable worksheets, and a cumulative assessment.
Elementary School Worksheets and Lesson Plans
Ages 7–10These 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
Ages 10–13These 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
Ages 13+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
Ages 13+These lesson plans and worksheets teach students in grades 9 and up the statistical principles they need to analyze data rationally.
Printable Logical Fallacy Handbook
Ages 13+A printable PDF explaining 20 common logical fallacies with real-world examples. Recommended for teens and adults.
Printable Logic Puzzle Cards
Ages 10+Printable logic puzzle cards with answers and explanations. Varied levels mean they will challenge kids, teens, and even adults.
Printable Data Analysis Handbook
Ages 13+A printable PDF explaining 8 common errors in data analysis with real-world examples. Recommended for teens and adults.
The Language of Science: Facts, Laws, and Theories
Ages 11+This free science literacy worksheet teaches the difference between facts, laws, and theories and addresses common misconceptions. Recommended for grade 6 and up.
Printable Formal Fallacy Handbook
Ages 13+A printable PDF explaining 6 formal fallacies with examples. Recommended for teens and adults.