🧮 Calculation Training

Focused exercises and methods for sharpening mental arithmetic and numerical fluency. Readers turn to these books to build speed, accuracy, and confidence with numbers.

Speed Mathematics

by Bill Handley • 2003

Calculate faster than a calculator using only a pencil, a circle, and simple subtraction.

3.98

146

🧮 Mental Arithmetic ✂️ Calculation Shortcuts ⚡ Rapid Calculation

Speed Mathematics 90%

Calculate faster than a calculator using only a pencil, a circle, and simple subtraction.

by Bill Handley 2003

3.98

146 ratings

🧮 Mental Arithmetic ✂️ Calculation Shortcuts ⚡ Rapid Calculation

Mathematics

by Trevor Johnson • 2010

From arithmetic to algebra: a self-teaching path for the math you forgot or never had.

4.07

104

🧮 Basic Mathematics 📊 Numeracy Skills 📚 Self-Study Math

Mathematics 89%

From arithmetic to algebra: a self-teaching path for the math you forgot or never had.

by Trevor Johnson 2010

4.07

104 ratings

🧮 Basic Mathematics 📊 Numeracy Skills 📚 Self-Study Math

Secrets of Mental Math

by Arthur T. Benjamin • 1993

How a stage performer adds, multiplies, and pulls weekdays from thin air, without a calculator.

4.07

2k+

🧮 Mental Calculation ⚡ Speed Mathematics 🧠 Memory Techniques

Secrets of Mental Math 89%

How a stage performer adds, multiplies, and pulls weekdays from thin air, without a calculator.

by Arthur T. Benjamin 1993

4.07

2k+ ratings

🧮 Mental Calculation ⚡ Speed Mathematics 🧠 Memory Techniques

The Power of Vedic Maths

by Atul Gupta • 2013

Sixteen ancient formulas that turn mental math into a reflex, even for squares and roots.

4.05

157

🧮 Mental Math 🕉️ Vedic Math 🇮🇳 Indian Mathematics

The Power of Vedic Maths 89%

Sixteen ancient formulas that turn mental math into a reflex, even for squares and roots.

by Atul Gupta 2013

4.05

157 ratings

🧮 Mental Math 🕉️ Vedic Math 🇮🇳 Indian Mathematics

Vedic Mathematics Made Easy

by Dhaval Bathia • 2006

Cube roots in seconds: ancient mental shortcuts that make complex arithmetic feel like cheating.

4.04

280

🧠 Mental Arithmetic ✂️ Math Shortcuts 📝 Competitive Exam Prep

Vedic Mathematics Made Easy 89%

Cube roots in seconds: ancient mental shortcuts that make complex arithmetic feel like cheating.

by Dhaval Bathia 2006

4.04

280 ratings

🧠 Mental Arithmetic ✂️ Math Shortcuts 📝 Competitive Exam Prep

Basic Math & Pre-Algebra For Dummies

by Mark Zegarelli • 2007

For the math-anxious: rebuild arithmetic from the ground up so algebra finally makes sense.

4.10

220

🧮 Arithmetic Fundamentals 🏗️ Pre-Algebra Foundations 📖 Math Literacy

Basic Math & Pre-Algebra For Dummies Summary

Basic Math & Pre-Algebra For Dummies 89%

For the math-anxious: rebuild arithmetic from the ground up so algebra finally makes sense.

by Mark Zegarelli 2007

4.10

220 ratings

🧮 Arithmetic Fundamentals 🏗️ Pre-Algebra Foundations 📖 Math Literacy

Digital Games and Mathematics Learning

by Lowrie • 2015

Digital games sharpen the spatial skills math requires, but picking the right app is the hard part.

4.00

🧮 Math Education 🎮 Game-Based Learning 💻 Educational Technology

Digital Games and Mathematics Learning Summary

Digital Games and Mathematics Learning 88%

Digital games sharpen the spatial skills math requires, but picking the right app is the hard part.

by Lowrie 2015

4.00

1 ratings

🧮 Math Education 🎮 Game-Based Learning 💻 Educational Technology

Arithmetic

by Paul Lockhart • 2017

Arithmetic is a craft, not a grind. The elegant patterns hiding in every counting system.

3.92

236

🧠 Mathematical Thinking 📜 History Of Math 🔢 Number Representation

Arithmetic 88%

Arithmetic is a craft, not a grind. The elegant patterns hiding in every counting system.

by Paul Lockhart 2017

3.92

236 ratings

🧠 Mathematical Thinking 📜 History Of Math 🔢 Number Representation

Math for Grownups

by Laura Laing • 2011

The arithmetic you lost after school, applied to tips, taxes, recipes, and home projects.

3.80

149

🔢 Everyday Math 🧠 Mental Math 😰 Math Anxiety

Math for Grownups 88%

The arithmetic you lost after school, applied to tips, taxes, recipes, and home projects.

by Laura Laing 2011

3.80

149 ratings

🔢 Everyday Math 🧠 Mental Math 😰 Math Anxiety

Can You Solve My Problems?

by Alex Bellos • 2016

A wolf, a goat, a cabbage, and the puzzles that teach you to think in proofs.

4.03

387

🧩 Recreational Mathematics 📚 Puzzle Collections 🧠 Mathematical Thinking

Can You Solve My Problems? 88%

A wolf, a goat, a cabbage, and the puzzles that teach you to think in proofs.

by Alex Bellos 2016

4.03

387 ratings

🧩 Recreational Mathematics 📚 Puzzle Collections 🧠 Mathematical Thinking

Building Thinking Classrooms in Mathematics, Grades K-12

by Peter Liljedahl • 2020

Why 80% of students fake it in math class: the environmental shock that gets them thinking.

4.51

3k+

📐 Math Education 👀 Visible Thinking 🤝 Collaborative Learning

Building Thinking Classrooms in Mathematics, Grades K-12 Summary

Building Thinking Classrooms in Mathematics, Grades K-12 88%

Why 80% of students fake it in math class: the environmental shock that gets them thinking.

by Peter Liljedahl 2020

4.51

3k+ ratings

📐 Math Education 👀 Visible Thinking 🤝 Collaborative Learning

Senior Secondary School Mathematics For Class - 12

by R.S. Aggarwal • 2013

Ace Class 12 math: every topic, from relations to calculus, explained with clarity.

3.72

294

📐 Precalculus 📚 High School Math 🔺 Trigonometry

Senior Secondary School Mathematics For Class - 12 Summary

Senior Secondary School Mathematics For Class - 12 88%

Ace Class 12 math: every topic, from relations to calculus, explained with clarity.

by R.S. Aggarwal 2013

3.72

294 ratings

📐 Precalculus 📚 High School Math 🔺 Trigonometry

Guesstimation

by Lawrence Weinstein • 2008

How to answer impossible questions with a napkin, a pen, and a few simple guesses.

3.75

432

📝 Back-Of-The-Envelope Math ⚛️ Everyday Physics 🔢 Quantitative Reasoning

Guesstimation 88%

How to answer impossible questions with a napkin, a pen, and a few simple guesses.

by Lawrence Weinstein 2008

3.75

432 ratings

📝 Back-Of-The-Envelope Math ⚛️ Everyday Physics 🔢 Quantitative Reasoning

Mathematical Mindsets

by Jo Boaler • 2015

Math ability isn't fixed; every mistake grows the brain, and how you teach determines who succeeds.

4.44

3k+

🧮 Math Education 🧠 Growth Mindset 🔬 Brain Plasticity

Mathematical Mindsets 88%

Math ability isn't fixed; every mistake grows the brain, and how you teach determines who succeeds.

by Jo Boaler 2015

4.44

3k+ ratings

🧮 Math Education 🧠 Growth Mindset 🔬 Brain Plasticity

Bobby Fischer Teaches Chess

by Bobby Fischer • 1966

Fischer's chess primer skips openings entirely, drilling nothing but the patterns that finish games.

4.02

7k+

🆕 Beginner Chess ⚔️ Chess Tactics ♟️ Checkmate Patterns

Bobby Fischer Teaches Chess 88%

Fischer's chess primer skips openings entirely, drilling nothing but the patterns that finish games.

by Bobby Fischer 1966

4.02

7k+ ratings

🆕 Beginner Chess ⚔️ Chess Tactics ♟️ Checkmate Patterns

Essential Poker Math, Expanded Edition

by Alton Hardin • 2016

Poker math that wins: equity, odds, bet sizing, and the shortcuts that replace a calculator.

4.19

670

🃏 Poker Strategy 🧮 Poker Mathematics 🃏 No Limit Holdem

Essential Poker Math, Expanded Edition Summary

Essential Poker Math, Expanded Edition 88%

Poker math that wins: equity, odds, bet sizing, and the shortcuts that replace a calculator.

by Alton Hardin 2016

4.19

670 ratings

🃏 Poker Strategy 🧮 Poker Mathematics 🃏 No Limit Holdem

Street-Fighting Mathematics

by Sanjoy Mahajan • 2010

A toolkit for rough-and-ready problem solving: estimate with units, symmetry, and clever shortcuts.

3.74

236

✏️ Back-Of-The-Envelope 📏 Dimensional Analysis 💡 Heuristic Reasoning

Street-Fighting Mathematics 88%

A toolkit for rough-and-ready problem solving: estimate with units, symmetry, and clever shortcuts.

by Sanjoy Mahajan 2010

3.74

236 ratings

✏️ Back-Of-The-Envelope 📏 Dimensional Analysis 💡 Heuristic Reasoning

Hacking Mathematics

by Denis Sheeran • 2018

Stop giving answers, start asking questions: ten shifts that build mathematical thinkers.

4.47

📐 Math Education 🔍 Inquiry-Based Learning 📝 Homework Redesign

Hacking Mathematics 88%

Stop giving answers, start asking questions: ten shifts that build mathematical thinkers.

by Denis Sheeran 2018

4.47

19 ratings

📐 Math Education 🔍 Inquiry-Based Learning 📝 Homework Redesign

Mathematics

by Timothy Gowers • 2002

Real mathematics does not compute. It builds worlds where objects are defined by their behavior.

3.86

2k+

📐 Pure Mathematics 🧠 Mathematical Thinking 🌌 Mathematical Abstraction

Mathematics 87%

Real mathematics does not compute. It builds worlds where objects are defined by their behavior.

by Timothy Gowers 2002

3.86

2k+ ratings

📐 Pure Mathematics 🧠 Mathematical Thinking 🌌 Mathematical Abstraction

Maths Doesn't Suck

by Danica McKellar • 2007

Middle school math through pizza, shopping, and straight talk: no genius required.

4.18

1k+

🧮 Middle School Math 😰 Math Anxiety 🛒 Practical Math

Maths Doesn't Suck 87%

Middle school math through pizza, shopping, and straight talk: no genius required.

by Danica McKellar 2007

4.18

1k+ ratings

🧮 Middle School Math 😰 Math Anxiety 🛒 Practical Math

Basic Mathematics

by Serge Lang • 1988

From integers to hyperbolas: a systematic build-up of every idea you need before calculus.

4.30

181

📐 Pre-Calculus 📏 Plane Geometry 📈 Coordinate Geometry

Basic Mathematics 87%

From integers to hyperbolas: a systematic build-up of every idea you need before calculus.

by Serge Lang 1988

4.30

181 ratings

📐 Pre-Calculus 📏 Plane Geometry 📈 Coordinate Geometry

How to Study for a Mathematics Degree

by Lara Alcock • 2012

School math was calculation. University math is proof. How to bridge the gap without drowning.

4.09

221

🧮 Proof-Based Mathematics 🎓 Math Undergraduates ✍️ Mathematical Writing

How to Study for a Mathematics Degree Summary

How to Study for a Mathematics Degree 87%

School math was calculation. University math is proof. How to bridge the gap without drowning.

by Lara Alcock 2012

4.09

221 ratings

🧮 Proof-Based Mathematics 🎓 Math Undergraduates ✍️ Mathematical Writing

Math-ish

by Jo Boaler • 2024

The brain uses five pathways for math. Schools teach to one, and millions walk away.

4.23

570

🧮 Math Education 🌱 Growth Mindset 🔢 Number Sense

Math-ish 87%

The brain uses five pathways for math. Schools teach to one, and millions walk away.

by Jo Boaler 2024

4.23

570 ratings

🧮 Math Education 🌱 Growth Mindset 🔢 Number Sense

Why Study Mathematics?

by Vicky Neale • 2020

A math degree opens careers from kidney swaps to climate models. Effort trumps genius every time.

3.97

📐 Applied Mathematics 🧠 Growth Mindset 📊 Data Science

Why Study Mathematics? 87%

A math degree opens careers from kidney swaps to climate models. Effort trumps genius every time.

by Vicky Neale 2020

3.97

38 ratings

📐 Applied Mathematics 🧠 Growth Mindset 📊 Data Science

Mathematica

by David Bessis • 2024

Real math isn't done with symbols. It's done with mental images, physical intuition, and curiosity.

4.18

862

🧮 Mathematical Thinking 💭 Philosophy Of Mathematics 🧠 Intuition And Reason

Mathematica 87%

Real math isn't done with symbols. It's done with mental images, physical intuition, and curiosity.

by David Bessis 2024

4.18

862 ratings

🧮 Mathematical Thinking 💭 Philosophy Of Mathematics 🧠 Intuition And Reason

The Math of Life and Death

by Kit Yates • 2019

Key mathematical ideas govern medicine, law, and media, and your intuition gets each one wrong.

3.90

2k+

The Math of Life and Death 87%

Key mathematical ideas govern medicine, law, and media, and your intuition gets each one wrong.

by Kit Yates 2019

3.90

2k+ ratings

The Little Book of Mathematical Principles, Theories & Things

by Robert Solomon • 2008

A compact tour through math's biggest ideas: zero, infinity, and the proof that broke mathematics.

3.97

438

🏛️ History Of Mathematics 📐 Math Primers 🧱 Mathematical Foundations

The Little Book of Mathematical Principles, Theories & Things Summary

The Little Book of Mathematical Principles, Theories & Things 87%

A compact tour through math's biggest ideas: zero, infinity, and the proof that broke mathematics.

by Robert Solomon 2008

3.97

438 ratings

🏛️ History Of Mathematics 📐 Math Primers 🧱 Mathematical Foundations

Letters to a Young Mathematician

by Ian Stewart • 2006

Proof is story, pure and applied one: a mathematician's letters on the creative life of numbers.

3.86

2k+

🧩 Mathematical Proof 🎓 Math Education 💡 Mathematical Creativity

Letters to a Young Mathematician Summary

Letters to a Young Mathematician 87%

Proof is story, pure and applied one: a mathematician's letters on the creative life of numbers.

by Ian Stewart 2006

3.86

2k+ ratings

🧩 Mathematical Proof 🎓 Math Education 💡 Mathematical Creativity

How to Prepare for Quantitative Aptitude for the CAT Common Admission Test

by Arun Sharma • 2012

Six blocks to CAT quant mastery: why addition, not algebra, is the real differentiator.

4.22

288

🧮 Quantitative Aptitude 🎓 MBA Entrance Exams ⚡ Speed Math

How to Prepare for Quantitative Aptitude for the CAT Common Admission Test Summary

How to Prepare for Quantitative Aptitude for the CAT Common Admission Test 87%

Six blocks to CAT quant mastery: why addition, not algebra, is the real differentiator.

by Arun Sharma 2012

4.22

288 ratings

🧮 Quantitative Aptitude 🎓 MBA Entrance Exams ⚡ Speed Math

Pluses and Minuses

by Stefan Buijsman • 2018

Three mathematical discoveries run your digital life; understanding them is simpler than you think.

3.41

290

🧮 Applied Mathematics 📜 History Of Mathematics 🔢 Mathematical Literacy

Pluses and Minuses 87%

Three mathematical discoveries run your digital life; understanding them is simpler than you think.

by Stefan Buijsman 2018

3.41

290 ratings

🧮 Applied Mathematics 📜 History Of Mathematics 🔢 Mathematical Literacy

Number

by Tobias Dantzig • 1930

The story of number, from zero to infinity, is a series of crises that redefined reality.

4.09

637

🏛️ History Of Mathematics 🤔 Philosophy Of Math 🧠 Numerical Cognition

Number 87%

The story of number, from zero to infinity, is a series of crises that redefined reality.

by Tobias Dantzig 1930

4.09

637 ratings

🏛️ History Of Mathematics 🤔 Philosophy Of Math 🧠 Numerical Cognition

The Joy of Abstraction

by Eugenia Cheng • 2022

What if math’s deepest lesson is that context always beats content? A category theorist explains.

3.84

190

🔢 Category Theory 🧠 Mathematical Thinking 📚 Popular Mathematics

The Joy of Abstraction 87%

What if math’s deepest lesson is that context always beats content? A category theorist explains.

by Eugenia Cheng 2022

3.84

190 ratings

🔢 Category Theory 🧠 Mathematical Thinking 📚 Popular Mathematics

A Mathematician's Lament

by Paul Lockhart • 2009

A working mathematician explains why math class was boring: you never saw the real thing.

4.21

3k+

🧮 Math Education 📋 Curriculum Critique ✨ Mathematical Beauty

A Mathematician's Lament 87%

A working mathematician explains why math class was boring: you never saw the real thing.

by Paul Lockhart 2009

4.21

3k+ ratings

🧮 Math Education 📋 Curriculum Critique ✨ Mathematical Beauty

Is Maths Real? How Simple Questions Lead Us to Mathematics’ Deepest Truths

by Eugenia Cheng • 2023

Math is not about right answers but about asking why. A manifesto for the curious.

3.52

731

📐 Philosophy Of Math 🧮 Mathematical Thinking 📚 Math Pedagogy

Is Maths Real? How Simple Questions Lead Us to Mathematics’ Deepest Truths Summary

Is Maths Real? How Simple Questions Lead Us to Mathematics’ Deepest Truths 87%

Math is not about right answers but about asking why. A manifesto for the curious.

by Eugenia Cheng 2023

3.52

731 ratings

📐 Philosophy Of Math 🧮 Mathematical Thinking 📚 Math Pedagogy

Thinking Better

by Marcus du Sautoy • 2021

Mathematical shortcuts that save time, solve problems, and show you what everyone else overlooks.

3.59

618

🧮 Mathematical Thinking 🧠 Mental Shortcuts 🔍 Pattern Recognition

Thinking Better 87%

Mathematical shortcuts that save time, solve problems, and show you what everyone else overlooks.

by Marcus du Sautoy 2021

3.59

618 ratings

🧮 Mathematical Thinking 🧠 Mental Shortcuts 🔍 Pattern Recognition

What's Math Got to Do with It?

by Jo Boaler • 2008

Why ability grouping and timed tests backfire, and what builds mathematical thinkers instead.

4.28

1k+

🧮 Math Education 🔍 Inquiry-Based Learning 😟 Math Anxiety

What's Math Got to Do with It? 87%

Why ability grouping and timed tests backfire, and what builds mathematical thinkers instead.

by Jo Boaler 2008

4.28

1k+ ratings

🧮 Math Education 🔍 Inquiry-Based Learning 😟 Math Anxiety

Beyond Numeracy

by John Allen Paulos • 1990

Math, not as right answers, but as a lens on chaos, coincidence, and everyday decisions.

3.83

498

Beyond Numeracy 87%

Math, not as right answers, but as a lens on chaos, coincidence, and everyday decisions.

by John Allen Paulos 1990

3.83

498 ratings

Limitless Mind

by Jo Boaler • 2019

The brain grows most when you struggle and get things wrong. The science that changes how you learn.

4.09

3k+

🧠 Neuroplasticity 🌱 Growth Mindset 🧮 Math Education

Limitless Mind 87%

The brain grows most when you struggle and get things wrong. The science that changes how you learn.

by Jo Boaler 2019

4.09

3k+ ratings

🧠 Neuroplasticity 🌱 Growth Mindset 🧮 Math Education

How to Bake Pi

by Eugenia Cheng • 2015

Math is logical structure, not calculation. Category theory reveals it; baking makes it stick.

3.64

2k+

How to Bake Pi 87%

Math is logical structure, not calculation. Category theory reveals it; baking makes it stick.

by Eugenia Cheng 2015

3.64

2k+ ratings

Infinite Powers

by Steven H. Strogatz • 2019

GPS, planets, CT scans: one trick solves them all. Break the impossible into infinite tiny parts.

4.29

7k+

🔢 History Of Calculus 📐 Popular Mathematics 🧠 Mathematical Thinking

Infinite Powers 87%

GPS, planets, CT scans: one trick solves them all. Break the impossible into infinite tiny parts.

by Steven H. Strogatz 2019

4.29

7k+ ratings

🔢 History Of Calculus 📐 Popular Mathematics 🧠 Mathematical Thinking

Mind Performance Hacks

by Ron Hale-Evans • 2006

Memory tricks, mental math, decision hacks: a cognitive toolkit for thinking faster and clearer.

3.88

945

🧠 Mnemonic Techniques 🔢 Mental Math 🏋️ Brain Training

Mind Performance Hacks 87%

Memory tricks, mental math, decision hacks: a cognitive toolkit for thinking faster and clearer.

by Ron Hale-Evans 2006

3.88

945 ratings

🧠 Mnemonic Techniques 🔢 Mental Math 🏋️ Brain Training

The Woodpecker Method

by Axel Smith • 2018

A puzzle set you repeat faster and faster until your subconscious does the calculating for you.

4.32

128

🧩 Tactical Puzzles 📋 Chess Training 🎯 Deliberate Practice

The Woodpecker Method 87%

A puzzle set you repeat faster and faster until your subconscious does the calculating for you.

by Axel Smith 2018

4.32

128 ratings

🧩 Tactical Puzzles 📋 Chess Training 🎯 Deliberate Practice

Improve Your Chess Calculation

by Ramesh RB • 2022

The secret isn't more puzzles. It's a system for seeing further and calculating deeper.

4.08

👁️ Visualization Practice 🧠 Chess Analysis ⚡ Dynamic Play

Improve Your Chess Calculation 87%

The secret isn't more puzzles. It's a system for seeing further and calculating deeper.

by Ramesh RB 2022

4.08

13 ratings

👁️ Visualization Practice 🧠 Chess Analysis ⚡ Dynamic Play

Chess Training Pocket Book

by Lev Alburt • 1997

Most chess knowledge never wins a game. These 300 positions will.

4.28

105

♟️ Chess Training 🏆 Tournament Chess 👁️ Tactical Pattern Recognition

Chess Training Pocket Book 87%

Most chess knowledge never wins a game. These 300 positions will.

by Lev Alburt 1997

4.28

105 ratings

♟️ Chess Training 🏆 Tournament Chess 👁️ Tactical Pattern Recognition

Python for Data Analysis

by Oscar Scratch • 2019

Python data analysis, taught through questions: NumPy, Pandas, and the bridge to machine learning.

3.50

🧮 Scientific Computing 🔄 Data Manipulation 📊 Data Visualization

Python for Data Analysis 87%

Python data analysis, taught through questions: NumPy, Pandas, and the bridge to machine learning.

by Oscar Scratch 2019

3.50

2 ratings

🧮 Scientific Computing 🔄 Data Manipulation 📊 Data Visualization

Introduction to Linear Algebra

by Gilbert Strang • 1993

Linear algebra organized around a matrix's core spaces: from elimination straight to the SVD.

4.24

703

📐 Applied Linear Algebra 🧩 Matrix Factorizations ↔️ Vector Spaces

Introduction to Linear Algebra 87%

Linear algebra organized around a matrix's core spaces: from elimination straight to the SVD.

by Gilbert Strang 1993

4.24

703 ratings

📐 Applied Linear Algebra 🧩 Matrix Factorizations ↔️ Vector Spaces

Alex's Adventures in Numberland

by Alex Bellos • 2010

How counting became civilization's greatest invention, and the puzzling patterns it revealed.

4.12

6k+

Alex's Adventures in Numberland 87%

How counting became civilization's greatest invention, and the puzzling patterns it revealed.

by Alex Bellos 2010

4.12

6k+ ratings

Introduction to Real Analysis

by Robert G. Bartle • 1982

A rigorous foundation in real numbers and limits: the proofs that make calculus unshakeable.

4.00

311

🧮 Real Analysis 📐 Rigorous Calculus 📝 Mathematical Proofs

Introduction to Real Analysis 86%

A rigorous foundation in real numbers and limits: the proofs that make calculus unshakeable.

by Robert G. Bartle 1982

4.00

311 ratings

🧮 Real Analysis 📐 Rigorous Calculus 📝 Mathematical Proofs

Robin Hood Math

by Noah Giansiracusa • 2025

Algorithms price your insurance, rank your resume, curate your reality. The math that fights back.

3.91

185

🧮 Algorithmic Literacy 🛡️ Digital Self-Defense 📐 Applied Mathematics

Robin Hood Math 86%

Algorithms price your insurance, rank your resume, curate your reality. The math that fights back.

by Noah Giansiracusa 2025

3.91

185 ratings

🧮 Algorithmic Literacy 🛡️ Digital Self-Defense 📐 Applied Mathematics

The GCHQ Puzzle Book

by GCHQ • 2019

A spy agency's Christmas card puzzle drew half a million solvers. Their full vault is open.

4.02

402

🔐 Cryptography 🔓 Codebreaking 🧩 Logic Puzzles

The GCHQ Puzzle Book 86%

A spy agency's Christmas card puzzle drew half a million solvers. Their full vault is open.

by GCHQ 2019

4.02

402 ratings

🔐 Cryptography 🔓 Codebreaking 🧩 Logic Puzzles

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