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

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

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 ...

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.