Title: aha! Insight
Description: Contains puzzles that first baffle and then delight problem solving addicts. Grew out of a collaboration between Bob Tappay and Martin Gardner to enliven the learning of mathematics.
Subjects: Puzzles, Problem solving, Mathematical recreations, Recreatieve wiskunde, Probleemoplossing, Puzzles. 0, Jeux mathématiques, Mathématiques, Jeux et récréations mathématiques, Résolution de problème, Devinettes et énigmes, 31.99 mathematics: other