Part I: Income Taxes, Lottery, and Lion Hunting-Elementary Mathematics.- 1. "We Take over Your VAT!" How Big Is the Actual Discount?.- 2. Millions Every Week, but Not for Me. Six Numbers in the Lottery.- 3. Where Did My Money Go? Loss Compensation After a Price Drop.- 4. How Do You Catch a Lion? Finding a Zero by Halving the Interval.- 5. Upside Down and Up Again. How Many Zeros Does a Polynomial Have?.- 6. "According to Adam Ries, that Comes to...