This is a nice one from the 2021 AMC 12 B, an Olympiad qualifying test in America. Art of Problem Solving …

# Category: Math

## String of Beads Puzzle From The Manga Q.E.D.

This is from a Manga called Q.E.D. I thank Sparky from the Philippines for the suggestion! A string of beads divides circles of equal …

## Solving a geometry question that no one can figure out

A puzzle created by Dare2Solve caught the attention of many people when it was posted on Reddit AskMath with the title that it …

## Simple question goes viral. Most students get this wrong

This problem received 6 million views in a viral Instagram post. Is the correct answer -9² + 81 = 162 or is it -9² + 81 = 0 instead?

## Impossible Interview Question – Perfectly Spaced Numbers

While observing his child play with toy blocks, C. Dudley Langford invented a puzzle that is still unsolved to this day! Special …

## Error Correcting Curves – Numberphile

Isabel Vogt on error correction, curves, and some big polynomials. Extra footage at: https://youtu.be/eLPfRY4NATw More links …

## What do sports betting odds actually mean?

As sports leagues have embraced gambling, betting lines are becoming ubiquitous and understanding them is an important skill …