The arrangement leaves gaps in the square’s four corners, two of which are filled with smaller circles that just barely touch ...

I’ve been out of school for decades, and I don’t spend my days solving equations (I’m more of a word person). Still, I like to think I have a solid grip on basic math: I can usually gauge whether a ...

Exactly how many triangles can you count in this fun triangle puzzle?

Add Yahoo as a preferred source to see more of our stories on Google. The hour, minute and second hands of this clock are all the same length and move smoothly in a circle. The dial contains hour and ...

These low-floor, high-ceiling problems support differentiation, challenging all students by encouraging flexible thinking and allowing for multiple solution paths.