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Not Like The Others: Rivers

Four rivers. One doesn’t belong. But which one? That depends on your argument.

How Many Ways: Multiply Fractions Equal 1/4

One equation. Digits one through nine. How many ways can you make it work?

Not Like The Others: Countries

How is each of these four countries not like the others?

Invisible Power Can Have Visible Effects

Can you think of times when power is unseen, but we can clearly see its effects?

Math Curiosity: Collatz Conjecture

The Collatz Conjecture: start with any number and get to 1 using just two rules. It seems to always work…