The Fantastic Formula
Arithmetricks
Math Problem for my Mensa Friends
Second Guessing -- Approximating
Math Maze
Another Math Maze
Number Trivia
Nines Puzzle
Calculatrivia I (GAMES Magazine NOV/DEC 1978)
Calculatrivia II (GAMES Magazine NOV/DEC 1979)
Calculatrivia III (GAMES Magazine July/August 1981)
Calculatrivia IV (GAMES Magazine JULY 1986)
Trivia Magic Square