This quick, zero-prep math activity will surprise your middle schooler in the best way. You’ll walk through the classic challenge: Would you rather have $250,000 today or a penny doubled for 31 days? Most kids pick the cash—until they see what doubling really does. This free mini-lesson teaches exponential growth, prediction, and logical thinking in a way kids instantly connect with. It’s short, fun, and perfect for days when you just need one meaningful win.