Amusements in Mathematics

Metadata

Gutenberg ID

16713

Title

Amusements in Mathematics

Language

en

Book source

Project Gutenberg

Description max 80 words

Henry Ernest Dudeney presents a collection of mathematical puzzles and brain teasers designed to amuse and challenge the reader. Spanning arithmetic, geometry, logic, and chessboard problems, this volume invites solvers to reason through clever conundrums involving money, dissection, and games. With a light, engaging tone, it offers both simple exercises for beginners and difficult challenges for advanced mathematicians, proving that exact thinking is accessible to everyone.

Summary up to 500 words

Published in 1917, Henry Ernest Dudeney's *Amusements in Mathematics* serves as a comprehensive collection of recreational puzzles originally featured in periodicals such as *The Strand Magazine*. Dudeney argues that the history of exact thinking is rooted in the ability to solve puzzles, asserting that even simple riddles require logical reasoning. He emphasizes that the primary goal of the book is amusement mixed with knowledge, encouraging readers to attempt solutions independently before consulting the provided explanations. While some puzzles are accessible to novices, others present subtle traps that test careful attention to wording, appealing to experts as well. The volume is structured into distinct categories. The Arithmetical and Algebraical Problems section features money puzzles relying on early 20th-century British currency, age riddles, and algebraic word problems. Notable entries include the "Seven Men" puzzle, where players double each other's money in a sequence of games, and the "Beanfeast Puzzle," which involves dividing a sum among tradespeople based on spending ratios. Other arithmetic challenges include clock puzzles, locomotion and speed problems, and digital puzzles involving factorization. The Geometrical Problems section focuses heavily on dissection puzzles. Dudeney explores transforming Greek crosses into squares or triangles, solving the "Joiner's Problem" to form squares from irregular shapes, and cutting pentagons into pieces to create squares. He often provides solutions that explain underlying geometric principles, sometimes referencing historical precedents like those of Fermat or Euler. The book also includes magic squares, mazes, and river-crossing logic problems. Further sections cover moving counters, chessboard strategies involving statical and dynamical puzzles, and various games. Dudeney admits to occasional errors but maintains that the collection represents a significant contribution to recreational mathematics. By presenting problems in a popular dress, he aims to engage a broad audience, proving that mathematical logic is an essential part of everyday reasoning for everyone from children to advanced mathematicians.

LLM editorial rating

4.2/5

Download URL

https://www.gutenberg.org/ebooks/16713.epub.noimages

Local file path

data/epubs/pg16713.epub

Removed after upload

Downloaded at

2026-07-06 06:51 UTC

Categories

• Puzzles
• Mathematics