Step 1

Preface to the English edition
Review

Chapter 1: Basic Operations
Fun math puzzles
1 Children with good observation skills
2 Flowers made of jewels
3 Move the checker pieces
4 Move the match
5 What could it be?
6 How many hidden triangles are there?
7 Interesting Fountains
8 The Gardener's Path
9 Apples in the Basket
10 Don't think too long
11 Reasons Why Mess Is On the Rise
Crossing the 12 Rivers
13 Wolf, Goat, Cabbage
14 Roll and export
15 Repairing the Chain
16 Correcting Mistakes
17 3 to 4 (Trick Quiz)
18 3 plus 2 is 8 (Trick Quiz)
19 3 squares
20 How many items are there in total?
21 Placing Flags
22 Place the chair
23 Always even
24 Triangular Magic Square
25 Girls playing with a ball
26 straight lines 4
27 My age
28 Protect your cabbage from goats
29 Two trains
30 When the tide comes in (Trick Quiz)
31 clock face
32 Broken Clock Face
33 Mysterious Clocks
34 10 straight lines
35 3 per line
36 Arrange the coins
37 1~19
38 Fast but careful
39 crayfish full of numbers
40 The Restless Fly
41 Book price
42 years inverted
43 Two Tricks Quiz
44. Glance and speak
45 Quick Addition
46 Which hand is it?
47 How many people?
48 with the same number
Make 49 100
50 Operation Showdown
Make 51 20
52 How many roads are there?
53 Number sequence
54 Addition and subtraction signs
55 Different actions, same results
56 99 and 100
57 Fragmented Chessboard
58 Minesweeper
59 Stopped Clock
60 Bundle of 2
61 Group of 3
62 Confused Driver
63 Chimryansk power plant
64 Delivering Grain on Time
65 tram to Dacha
66 1~1,000,000,000
67 A soccer fan's nightmare
68 My Watch
69 Three slices of toast
Climb 70 stairs
71 Digital Puzzles
72 On the way to school
At the 73rd stadium
Can you save 74 hours?
75 Alarm Clock
76 Large pieces instead of small pieces
77 A block of soap
78 A computational problem that requires brainpower
79 Domino Fountain
80 Misha's Cat
81 average speed
82 sleeping passengers
83 Train length
84 cyclists
85 Competition
86 Who is right?

Chapter 2 Movement and Placement
Math puzzles that make you think more
87 The Blacksmith's Wit
88 How a Cat Catches a Mouse
89 Blackbird and Blackbird Cage
90 Coins on Match Heads
Let the 91 passenger train pass!
The whims of a 92-year-old girl
93 Given certain conditions
94 Jumping Checkers Pieces
95 Swap white and black
Problem 96
97 Generalization Problem
98 number cards placed in order
99 2-array puzzle
100 The Magical Box That Doesn't Reduce
101 Brave Defenders
102 pairs of cans
103 Turning on the lights
104 batches of experimental rabbits
105 Lighting Festival Preparation
106 Plant a tree
107 Geometry is required
108 Moving even and odd numbers
Move the number 109
110 Chinese Gift Box
111 Nitro Phone Catch
112 Change seats
113 Only one letter is allowed
Let's group the numbers 114
115 Where are the stars
116 The last one is number 1
117 Change the shape of the coin
118 Figure skaters on ice
119 Kolya Sinichkin's Chess
120 Escape from Prison
Find the key from 121

Chapter 3 Matchstick Geometry
Matchsticks are puzzle friends
122 Make a square
123 Another Twisted Trick Quiz 1
124 Another Twisted Trick Quiz 2
125 Move or remove
126 You can cross it
127 Match Snail House
128 Subtract 2 and leave 3
129 Make an equilateral triangle
130 If you dismantle the house, it becomes a square
131 Various polygons
132 How to remove a match
133 Floor
134 Move the fence
135 Making Squares and Rhombuses
136 Move the arrow
137 Original answers possible
138 Designing a Garden
139 pieces of equal area
140 Another Twisted Trick Quiz 3
141 Garden with a Well
142 A shape whose area is tripled
143 Crossing the Moat
144 Proof

Chapter 4: Separating and Rearranging Shapes
Jigsaw puzzles that enhance creativity and understanding
145 identical pieces
146 Dismantle and redeploy
147 Missing cutting line
148 Seven Roses on a Cake
149 All metal plates will be used
150 I need advice
151 When the fascists attacked
152 Memories of an Electrician
153 Don't waste it
154 How to Cut Horse Hooves
155 Cut twice and divide the hole
156 Making a Square with a Water Bottle
157 A square made of the letter E
158 Transformation of the Octagon
159 Restoring the Rug
160 Precious Rewards
161 Confirm the Impossible
162 Gifts for Grandma
163 The Furniture Maker's Problem
164 Tailors Need Math
165 Create the most pieces
166 Polygon to Square
167 4 Knights
168 Decompose a regular hexagon

Chapter 5 Applications and Design
The skills and benefits of mathematics
169 Where is the target?
170 Looking inside a cube
171 I need twice as much
172 Meeting of Two Trains
173 Use the triangle railroad
174 Will the belt turn all the way?
175 7 triangles
176 Measure three times and divide
177 Painter's Canvas
178 Can you save 100%?
How much does a 179 bottle weigh?
180 shot filled water bottle
Where is Sergeant 181?
182 Measuring without a measuring instrument
183 Originality of Design
184 Cutting a Cube
185 spring scale
Finding the center of a circle
187 Geometry of the Ball
188 Which box is heavier?
189 The Art of the Cabinet Maker
190 Wooden Beam Cube
Volume of 191 bottles
192 log diameter
193 The Difficulty of Calipers
194 Regular Polygon Slide
195 larger polygons
196 Creating a polygon in two steps

Chapter 6: Math Magic Games
Domino and dice puzzles to boost your math skills
How many points are there in 197?
198 The Last Domino
199 Surprise your friends
Win 200 games
201 A square with an empty center
202 windows with the same number
203 Domino Tile Magic Square
Magic square with 204 holes
205 Domino Multiplication
Guess the 206 tiles
207 Three-Dice Cheat
208 How many hidden numbers are there?
209 In what order would they be arranged?

Chapter 7 Intermediate Operations
The World of the Number 9
210 Which number was erased?
Special of 211 1313
212 Guess the missing number
From one number 213
Guessing by 214 differences
215 3 people's age
216 What is the secret?

solution

Step 2

Preface to the English edition
Review

Chapter 8 Algebra
When using algebra
217 Mutual Cooperation
218 How many times bigger is it?
219 The Lazy Man and the Devil
220 diesel ships and seaplanes
221 The Clever Boy
222 Hunters
Meeting of the 223 train
224 Vera's Document Typing
225 When does it start and when does it end?
226 Mushroom Incident
227 Will it take more or less?
Two 228 diesel ships
229 Swimmer and Hat
230 How Sharp Are You
231 Young Pioneers
232 The working speed of the lathe operator Bykov
Cyclist cycling around the 233 track
234 Jack London's Travels
235 New Station
236 False analogy
237 Two children
238 Who rode the horse?
239 Legal Disputes
240 Two people on a motorcycle
241 Which plane did you fly?
242 Equations Solved with Mental Calculation
243 seconds 2
244 Amazing Wisdom
245 Exact time
246 Two watches
247 Hour and Minute Hands
Teaching 248 soldiers
249 A separate journey
250 Choose four words
251 Defective Scale
252 Elephants and Mosquitoes
253 five-digit number
254 How old am I?
255 2 reports
256 Characteristics of simple fractions
257 Lucas Problem

Chapter 9 Schluß
Mathematics that requires no calculations
258 Shoes and Socks
259 apple boxes
260 Weather Forecast
261 Arbor Day Tree Planting
262 Name and Age Matching
263 Shooting Competition
264 Buying things
265 Logical Conjecture
267 Chess Tournament
268 Cutting firewood
269 ​​Who is the engineer?
270 Who is the culprit?
271 Gathering Herbs
272 Hidden Division
273 Motorcycle and Horse
274 Decryption
275 Prime Number Puzzle
276 on foot, by car
277 Three Greek Philosophers
278 Proof by Contradiction
279 Finding Counterfeit Coins
280 Five Questions
281 Reasoning without Equations
282 Child's age
283 Yes or No


Chapter 10 Game Theory
Math Games and Tricks
284 matches 11 pieces
285 The last person to pick up the item is the winner.
286 Even number wins
287 Waitop Game
288 How to win
289 Making a Square
290 Who will reach 100 first?
291 Square Game
292 Traditional Play Mancala
293 Geometric 'Extinction'
294 Similar Magic Square
295 Number Crossword Puzzle
296 Guessing the number 'thought'
297 Finding out without asking questions
298 Who took how much?
299 Three attempts
300 pencils and erasers
301 Guess 3 consecutive numbers
302 Guessing Multiple Numbers
303 How old are you?
304 Guessing Age
305 Italian Games

Chapter 11 Number Theory
Fun division
306 Number of graves
307 Four diesel ships
308 New Year's Gifts
309 Could there be such a number?
310 three-digit number
311 A Basket of Eggs
312 Cashier's Mistake
313 Number Puzzle
314 divided by 11
315 Divide by 7, 11, 13
Reduce to divide by 316 8
317 Amazing Memory
318 Divide by 3, 7, 19
319 Divide by 7 New Information
320 divided by 7, second information
Two theorems for dividing 321 by 7
322 Division General Test
323 Amazing Division

Chapter 12 Magic Square
Magical number arrangement, magic square
324 Hexagonal Star
325-atom crystal
326 Pentagonal Window Decoration
327 Hexagon
328 Planetarium
329 Overlapping Triangles
330 Interesting Sets
331 Travelers from China and India
332 Making a Magic Square
333 Test your wit
334 '15' Magic Game
335 Unusual Magic Square
336 center square
337 Interesting Calculations
338 Regular 4th order magic square
339 Perfect diagonal square


Chapter 13: Curious and Serious
Interesting and serious number
340 ten-digit number
341 more unusual numbers
342 Repeat the calculation
343 Number Spinner
344 Instant Multiplication Board
345 Intellectual Training
346 number pattern
347 One for all
348 Strange Numbers
349 positive integer sequence
350 permanent difference
351 Palindromic sum

Chapter 14 Prime, Fibonacci Numbers
It's been a while but
Forever young
352 Prime and Composite Numbers
353 Sieve of Eratosthenes
354 How many prime numbers are there in total?
355 Math Tournament
356 Fibonacci sequence
357 Shape Paradox
358 Characteristics of the Fibonacci Sequence
Characteristics of the 359th geometric figure

solution

1.
Math Logic Index Testbook: Boost your creativity and logical thinking with fun math puzzles.

Many famous mathematicians have said in media interviews that the time they spent solving puzzles at home developed their mathematical thinking more than the time they spent in school math classes, and in fact, it is said that children who are good at puzzles are better at math.
As you become familiar with math through puzzle books and practice mathematical thinking while solving problems, you will find that statistics, probability, calculus, and functions, which once seemed difficult, become easier to solve than you thought.
In short, the mathematical logic index increases.

2.
A long-time Amazon bestseller in the math puzzle category, edited by math puzzle master Martin Gardner.

Since its publication in Russia under the Soviet system, the Russian edition alone sold over a million copies until the English edition came out in 1972, and it was also published in Ukraine, Estonia, Latvia, Lithuania, Bulgaria, Romania, Hungary, Czechoslovakia, Poland, Germany, France, China, and Japan, where it enjoyed great popularity.
Martin Gardner, a renowned American math puzzle editor, wrote a preface to the first English edition, calling this book "a complete collection of math puzzles with a surprising variety of problems."
It is a long-term bestseller, ranking between 2nd and 10th in the Amazon math puzzle category, and is greatly loved by readers because it is composed of a wonderfully diverse content that stimulates brain activity.

3.
A classic math puzzle with beautiful retro illustrations.

This book, which has maintained the beautiful Russian original illustrations from the 1950s, not only delivers the fun but also the warmth of the original, has long been well-received by Amazon readers as “a math puzzle book that parents solve and children solve again, a brain training book that is difficult but makes you feel refreshed after solving it, a book that shows the strength of Russia, a math powerhouse, a book that is highly effective in making students’ brains soft if you have them solve one problem at a time before high school math class.”

4.
A math expert proofreader and a PhD in mathematics reviewer will kindly explain ambiguous problems and answers.

This book has been loved for a long time, but some problems were difficult because the explanations only gave the key points so that the reader had to think more.
The book was specifically proofread by a math expert, reviewed by a doctor of science specializing in math, and explained in simpler terms. Issues that have been the subject of controversy on the Internet have been annotated.
It not only provides hints on how to approach the problem, but also provides perspectives on the problem and the order of solutions to increase the reader's understanding.