Puzzles

The hint - world cup medallions

Monochromatic cows

Puzzle No. 6 Can you collect the whole set?

Puzzle No. 6 - world cup medallions

Complex multiplication

Three-digit numbers

Puzzle pageAre your multiplication problems real or imaginary?

Yet more taxis!

The coin tossing problem

Puzzle pageI'll take door number three...

The taxi problem revisited