Unique travel

1. Two observant young pioneers 1

2. "Gemstone Flower" 2

Question answer

8. Think fast 5

5. Count to see 4

9. Move up and down 6

Moving match

6. The Gardener's Road 5

7. Think about it. five

10. Crossing the river (ancient topic) 6

1 1.6.

12. Get out of the black ball.

13. Repair the chain 8

14. Three squares 9

15. How many parts are there?

16. Try 9

Step 3 Move the chess piece 3

17. Flag planting 9

18. Keep the even number 10.

19. "Mysterious" digital triangle 1 1

2 1. Four straight lines 13

20. 12 girls play ball 1 1

23. Two trains 14

24. At high tide (interesting topic) 14

22. Separate sheep from Chinese cabbage 13

25. Surface dialing 15

26. Crack the clock dial 15

27. Strange Clock (China Puzzle) 16

28. From 1 to 19 17

29. Be careful 17

33. Two interesting questions 19

35. Quickly add 2 1

34. How old am I, 20 years old?

32. Is there such a year 19?

3 1. restless flies 19

30. Geometric shrimp 18

38. How many people are there?

39. Use the same number 24.

37. Which hand (math trick) 24

36. Use your eyes to evaluate 23

40. 100 24

4 1. Arithmetic War 25

42.20 26

There are several routes.

44. Transform the position of each number 28.

45. Different operations have the same result.

46.99 and 100 29

47. Searching for landmines 29

48. Move into a group of two 3 1

49. Work in groups of three

50. The clock has stopped.

52. Stuck the driver 33

5 1 .4 arithmetic operations 33

53. Working for Zimryan Hydropower Station

54. Timely payment of food 35

55. On the train to the villa, 35

56. From 1 to/kloc-0 100000000 35

the second part

57. Table 36

58. Stairs 36

59. A nerve-racking topic 37

60. Interesting score 37

67. Arithmetic game 39

66. A bar of soap 38

6 1. What number is it? 37

63. On the playground

64. Did you save time?

65. Alarm clock 38

62. Student's journey 37

73. Competition 4 1

69. Average speed 40

68. Kittens in Misa 40

70. Sleeping passengers 40

72. Cyclists 4 1

7 1. How long is the train 4 1?

74. Who is right about 4 1?

75. There are three pieces of fried bread for dinner.

The second chapter is a nerve-racking topic

76. The blacksmith He Qiao wit 43

77. Cats and mice 45

78. Leave the yellowbird and the robin

79. Let the bus go through No.47.

80. Problems caused by three girls being naughty 48

8 1. Checkers 48

84. Two configuration challenges 49

82. Baizi and Sunspots 48

83. Put the paper next to No.49.

85. The mysterious box 50

86. Brave "garrison" 5 1

87. Fluorescent lamp in TV room 52

88. Separate release of experimental rabbits 53

89. Preparing for festivals 54

90. Plant an oak tree in different styles.

9 1. Geometry Game 56

92. Even and odd numbers (problems) 59

95. Special grouping of integers 1 to 15 62

94. The gift of thinking 60

96.8 stars 62

97. The theme of the two configuration letters 63

98. Color-coded box 63

99. The last piece of paper 64

100. Fancy athletes on artificial skating rink 64

10 1. 145 (question) 66

102. How do prisoners escape from prison 67

Chapter III Geometry of Matches

103. Four difficult problems

104.9 match 74

105. Spiral 75

106. Take down two matches 75

107. Interesting topic 76

108. Front view of the house 76

109. Triangle 77

1 1 1. Shed 78

1 10. How many matches should I take?

1 12. Interesting topic 78

1 13. Arrow 78

1 14. Square and diagonal square 79

1 15. There are several different polygons in a graph.

1 16. Orchard design 79

1 17. Divide into equal product parts 80

1 18. Keep the area ratio of 80.

1 19. Find Chart 8 1

120. Validation 8 1

12 1. Drawings and verification 8 1

Chapter IV Look before you leap.

122. Equal division 82

124. Graphics with lost contours 84

There are seven roses on the cake.

125. Please give your opinion.

126. Don't waste 85

128. Memories of electrical workers 87

127. When fascist bandits invaded Soviet territory, 87

129. Things are going well.

130. Difficulties

13 1. Cut the horseshoe 89

132. There is a hole in each part 89.

133. The "can" shape becomes a square 90.

134. Beautiful changes 90

135. Carpet repair 90

136. Precious prizes 9 1

137. A gift for grandma 92

138. joinery theme 93

139. The shoemaker also has geometry 94.

140. A horse and a stable 94

14 1.

142. Turn a regular hexagon into an equilateral triangle 96

148. Where is the target?

144. Think for five minutes 99

145. Unexpected meeting 100

Chapter 5 Smart people will use it everywhere.

146. Triangle Route 100

147. Weigh and check 10 1

148. Transmission 10 1

149.7 triangle 102

150. Bottle weight 102

15 1. Building blocks 103

152. Glass bottles and lead bullets 103

153. Where did the sergeant go? 104

154. Unexpected difficulties 104

155. The story of a technical school student 105

156. Can you save 100% oil 106?

158. Designer's wit 106

157. Use the spring scale 106

160. Which box weighs 108?

16 1. joinery technology 108

159. Find the center of the circle 107

162. Difficult conditions 108

Chapter VI Characteristics 9

163. Hidden features 1 12

164. There are several interesting ways to find the missing number 1 13.

165. Find the remaining three numbers 1 15 according to one number in the answer.

166. Guess the difference 1 15.

167. The age is 1 15.

168. What's the trick? 1 15

170. Hunter 122

172. Vera typed the manuscript with the typewriter 123.

17 1. Two opposite trains 122.

169. Smart kids 122

Chapter 7 Solving with or without Algebra

173. The Story of Mushrooms 123

174. Who came back early 125

175. Swimmers and hats 125

176. Two ships 126

177. Test your wit 127

178. Solving problems 127

How many times is 179. 128?

180. Shipping and seaplanes 128

18 1. fancy cyclists in the circus 128

182. The working speed of lathe tool is 130.

183. Jack. A trip to London 130

184. Improper comparison will lead to an error 130.

187. Who rides a horse 133?

186. Two-step counting and three-step counting 133

185. Special legal cases 132

188. Two motorcyclists 133

189. which plane is Volodya's father on? 134.

190. Division number 135

19 1. Two candles 135

192. amazing insight 135

193. "just in time" workshop 136

194. Table 136

195. When was it 136?

196. When will the meeting start and end? 137

197. sergeant training scouts 137

198. Two reports 138

199. How many new stations have been built 138?

200. Can we work out 139?

202. Five digits 14 1

20 1. Elephants and mosquitoes 140

203. Never grow old until you are 100 14 1.

204. The title of Liuka is 143.

206. A feature of simple score 144.

Chapter VIII Mathematics with Almost No Calculation

207. Apple 145

208. Weather forecast (interesting topic) 146

Arbor Day 146

2 10. Shooting Competition 147

2 1 1. Shopping 147

2 12. herbalist 148

2 13. Motorcyclists and riders 149

2 14. Walking and driving 149

2 15. Reduction to absurdity 150

2 16. Find counterfeit money 15 1.

2 18. Three Wise Men 152

2 17. No tie 152

2 19. Give students five questions 152.

220. Replace equation with thinking ..., 153

22 1. Thoughts on sound application 155

222. Yes or No 156

Chapter 9 Mathematical Games and Mathematical Magic

A. math games

223. 1 1 Dongxi 157

224. Take the last match 158

225. Even win 158

226. How to win? ……………………………………… 158 ―

Who was the first to say "100"159?

B. Mathematical Magic

228. Guess the number (7 questions) 160.

229. You can guess the result of the calculation without asking anything.

23 1. Try to guess once, twice, three times ... I can guess 167.

I know who has how many 166.

232. Whoever took the eraser took the pencil 168.

233. Guess the sum of three wanted addends 169.

234. Guess some good numbers 169.

236. Geometrical Magic (the missing straight bar) 17 1

240. A basket of eggs (old French name) 175

239. Will there be a number like 174?

238. New Year gifts 174

237. The number on the tombstone is 174.