Following the content of the standard school curriculum, this book presents in 418 problems and diversions the basic ideas of arithmetic. Averages, fractions, decimals, percent, powers and roots, etc. Shortcuts, checking methods, also introduced in this enjoyable format. 120 illustrations.
George J. Summers creates 50 new puzzles for fans eager to test their logic. The puzzles range in difficulty from the relatively simple examples at the beginning of the book to others that are tricky, complex and subtle enough to the test the expert.
Solve murder problems and robberies, see which fishermen are liars and how a blind man can identify color — purely by reasoning! Hours of mind-strengthening entertainment.
This is a collection of arithmetical puzzles which operate by substituting letters for numbers. The author clearly explains how to solve them, and they range from easy to very complex.
Challenge yourself with over 100 fresh paradoxes, puzzles, riddles, conundrums, word and number games for the jaded, skeptical puzzlist. Over 100 pages of comprehensive answers. Approximately 300 illustrations. "Excellent collection of unusual, offbeat, and completely original puzzles."—Scientific American.
