DEVIOUS MIND BENDING PUZZLES by Terry H. Stickels
The more time you spend performing mental gymnastics with these puzzles, the more creative and inventive you'll become. All you need to know is a little basic arithmetic. Pay close attention so you don't get misled by the tricky, devious instructions. What is 1,449 in Roman Numerals? (MCDXLIX) Unscramble this word into a familiar one: CRICKARFREE. (Firecracker.) Have fun!