Curated Video
Using Picture Graphs to Solve Take-Apart Problems
This video is a lesson on solving take-apart problems using information from picture graphs. It teaches students how to interpret and analyze data presented in a graph, and apply it to solve mathematical problems. The video also...
Curated Video
Students In China: Solve A Math Problem For Internet Access!
A calculus problem went viral! Some major websites are reporting that students at a university in China had to solve this for the WiFi password in a dining hall. This is actually a pretty fun calculus problem. Watch the video for its...
Curated Video
Most US College Students Cannot Solve This Basic Math Problem. The Working Together Riddle
To complete a job, it takes: Alice and Bob 2 hours, Alice and Charlie 3 hours, and Bob and Charlie 4 hours. How long will the job take if all 3 work together? Many, many US college students set up the equations incorrectly and get the...
Curated Video
The REAL Answer To The Viral Chinese Math Problem "How Old Is The Captain?"
Media outlets around the world went crazy over a 5th grade math exam question in China. But they all missed the real story! The problem actually dates back to French researchers in 1979. In this video I present the real story to the...
Curated Video
Can You Solve A Scottish Math Exam From 130 Years Ago?
This problem comes from an exam in 1888 for secondary school students. It was actually optional so it was considered to be a challenging problem. I bet some students today will struggle with it too, but it's the kind of problem solving I...
Curated Video
Ridiculously Easy Problem That Stumps Mathematicians
Peter Winkler's excellent book "Mathematical Puzzles: A Connoisseur's Collection" states this easy problem is known to frustrate even great mathematicians. Can you figure it out? Cut The Knot...
Curated Video
HARD Geometry Puzzle In The Simpsons
The Simpson's 26th season finale "Mathlete's Feat" is full of mathematical problems. The final problem is a challenging geometric problem. Can you figure it out? You can skip to 4:58 for the solution. Kudos to the writers of The...
Curated Video
Lune Of Hippocrates - Famous Ancient Math Problem
Hippocrates of Chios solved this, nearly 100 years before Euclid even wrote The Elements, and before we knew the exact formula for the area of a circle. This is said to be the first precise mathematical of the area between two curved...
Curated Video
Solve For The Radius. Challenging Problem From Indonesia!
Thanks to Devan from Lilin Bangsa Intercultural School for suggesting this problem! What is the radius of the small circle in between the blue circle (radius 4) and green circle (radius 2)? This was a challenge problem for students aged...
Curated Video
An Awesomely Evil Test Question And The Game Theory Answer
This test question went viral on Twitter and then got coverage in the Baltimore Sun and other mainstream media. But most of the coverage was wrong. This video explains the game theory answer. Blog post with a summary and more detailed...
Khan Academy
Converting Fahrenheit to Celsius, Pre-Algebra
Sal teaches students how to convert a temperature in Fahrenheit to its equivalent temperature in Celsius. He is explicit and very clear, which is suitable for those needing additional assistance or exposure to a particular topic.