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100 Numerical Games by Pierre Berloquin, Denis Dugas

Follow the hour hand and minute hand of a clock for 24 hours. How many times do they form a right angle?
Timothy's house has several rooms, each of which has an even number of doors, including doors that lead outside. Is the number of outside doors even or odd?
Stimulating and delightful, this collection of puzzles features original and classic brainteasers. The author, a puzzle columnist for Le Monde, specially selected these mind-benders for the widest possible audience, ensuring that they're neither too hard for those without a math background nor too easy for the mathematically adept. All puzzles are clearly stated and accurately answered at the back of the book ― and they're great fun to consider, whether you crack them or not. Includes a Foreword by Martin Gardner.

Product Details

ISBN-13: 9780486789583
Publisher: Dover Publications
Publication date: 08/19/2015
Edition description: First Edition, First
Pages: 160
Sales rank: 1,217,971
Product dimensions: 5.50(w) x 8.40(h) x 0.40(d)

About the Author

Pierre Berloquin is a French operations research engineer, writer, and game designer who has written more than 40 books in the area of recreational mathematics.

Read an Excerpt

100 Numerical Games

By Pierre Berloquin, Denis Dugas

Dover Publications, Inc.

Copyright © 1976 Pierre Berloquin
All rights reserved.
ISBN: 978-0-486-80569-6


Pierre Berloquin, who put together this stimulating and delightful collection of mind benders, is a clever young Frenchman who was born in 1939 in Tours and graduated in 1962 from the École Nationale Supérieure des Mines in Paris. His training as an operations research engineer gave him an excellent background in mathematics and logical thinking.

But Berloquin was more interested in writing than in working on operations research problems. After two years with a Paris advertising agency, he decided to try his luck at freelance writing and this is how he has earned his living since. In 1964 he began his popular column on "Games and Paradoxes" in the magazine Science et Vie (Science and Life). Another column, "From a Logical Point of View," appears twice monthly in The World of Science, a supplement of the Paris newspaper Le Monde. Occasionally he contributes to other French magazines. One of his favorite avocations is leading groups of "créativite," a French cocktail of brainstorming, synectics, and encounter therapy, for the discovery of new ideas and the solution of problems — a logical extension of his interest in puzzles.

Berloquin's published books are Le Livre des Jeux (card and board games), Le Jeu de Tarot (tarot card game), Testez Votre Intelligence (intelligence tests), 100 Grandes Réussites (solitaire games), Un Souvenir d'Enfance d'Evariste Galois (Memoir of the Childhood of Evariste Galois) and 100 Jeux de Cartes Classiques (card games); he is coauthor of Voulez-Vous Jouer avec Nous (Come Play with Us) and Le Livre des Divertissements (party games).

This volume is Berloquin's own translation into English of one of his four paperback collections of brainteasers which have been enormously popular in France and Italy since they were published in Paris in 1973. This one is concerned only with numerical puzzles. The other three contain geometric, logical, and alphabetical problems. Denis Dugas, the graphic artist who illustrated all four books, is one of the author's old friends.

The puzzles in this collection have been carefully selected or designed (many are original with the author or artist) so that none will be too difficult for the average reader who is not a mathematician to solve, and at the same time not be too easy. They are all crisply, clearly given, accurately answered at the back of the book, and great fun to work on whether you crack them or not.

At present, Berloquin is living in Neuilly, a Paris suburb, with his wife, Annie, and their two children.

Martin Gardner ]FOR


Excerpted from 100 Numerical Games by Pierre Berloquin, Denis Dugas. Copyright © 1976 Pierre Berloquin. Excerpted by permission of Dover Publications, Inc..
All rights reserved. No part of this excerpt may be reproduced or reprinted without permission in writing from the publisher.
Excerpts are provided by Dial-A-Book Inc. solely for the personal use of visitors to this web site.

Table of Contents


Foreword, vii,
Problems, 1,
Solutions, 103,

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