Mind-stretching Math Puzzles by Derrick Niederman
One of the world's most popular puzzle authors has come up with another collection of super-tricky mathematical brainteasers that are just great either for home or in the classroom. Hours of mind bending, brain-stretching fun awaits the puzzle solver, who can warm up with easy problems before moving on to harder and harder conundrums. Easy problems like this one: Hector can run from the railway station to his house in eight minutes. His younger brother Darius can run the same distance eight times in one hour. Who is the faster? Some of the puzzles present visual patterns to interpret, or play tricks with multiplication and division. Each puzzle will give the brain a good workout and improve your mathematics skills in the most enjoyable way. The answer to the problem (above) is Darius, who takes only 7.5 minutes.