Instructional Video5:27
Curated Video

MIND-BENDING LOGIC PUZZLE - The Self-Counting Sentence

6th - 11th
"In this sentence, the number of occurrences of the digit 0 is __, of the digit 1 is __, of the digit 2 is __, of the digit 3 is __, of the digit 4 is __, of the digit 5 is __, of the digit 6 is __, of the digit 7 is __, of the digit 8...
Instructional Video4:34
TED-Ed

Can You Solve the Counterfeit Coin Riddle?

7th - 12th Standards
Math enthusiasts and riddle gurus are sure to love a mind-bending puzzle involving a king, a scale, and a counterfeit coin. Middle and high schoolers work through a video that describes a mathematician's challenge to find a false coin in...