Number of knots/1
Babylonian hexadecimal /2
The origin of Arabic numeral /3
The root of division /3
Leakage /4
/kloc-the origin of 0 /5 minutes is another quarter/5.
The Birth of Integer /5
Introduction of negative numbers /7
Origin of operation symbol /8
Decimal story /9
Decimal experience/10
Relation symbol/12
Zero/12 anecdote
Numbers divisible by 2 and 5/13
Numbers divisible by 3 and 9/14.
Numbers divisible by 4 and 25/14.
Numbers divisible by 8 and 125/15.
Numbers divisible by 7, 1 1 and 13/15.
Symbol/16
Symmetric number/17
"Hours" and "Hours"/19
The riddle of "10 at10"/20
Ten million, ten thousand /20
Knowledge of coins /2 1
"Ruler" on human body /22
Music number /23
Knowledge of rolling pin /23
Replace the number /24 with letters.
Low temperature world /25
Animals and Mathematics /27
Raindrops and fog beads /28
Mathematics in Birds' Eggs /29
Animal "Count" /30
Wonderful cycle in life /3 1
Maximum tree age method /32
Mathematics on the sports field /34
Why don't people like "13"? /35
Measuring length /36
Interesting math story /38
Mathematicians in dreams /38
Numeric letters /39
Egg Banquet of Tang Poetry /4 1
Digital praise hero /42
The mouse escaped /44
Pi solved the case /45
Palindrome couplets /46
Cross the river /48
Han Xin Powder Oil /49
Cao Chong called the elephant /50.
Salvage iron ox /52
Wang Mian takes the ring /53
New Biography of Two Generations of Love /54
Clever Euler /55
Things are unknown /56
Edison cleverly calculated the light bulb /57.
The memory of mathematicians /59
Mathematical prodigy Gauss /60
Huanhuan Poetry /6 1
Hundred Birds Map /62
Literacy /63
Crossing the desert /64
Selling crickets /65
Rich bets /66
Smart into the enemy's nest /68
Interesting math problem /70
Eight without eight /70
The first nine and the last eight /7 1
Let it be 9/7 1.
992,000 /72
Four 4/73
Change /74
39-93, 74
Change card /75
Press each side /77
Oranges, biscuits and sugar /78
Always one beat behind /79
Digital riddle /80
Mathematical riddle /82
Clever calculation of sandwich candy /83
Four and a half weekends /84
Addition, subtraction, multiplication and division /84
Specific size of five-color wood block /85
Check the change /86
Mathematical problems on the clock face /87
Rapid change /88
Alternate addition and subtraction /88
Surface problems /89
Family age /90
Age of Grandfather and Grandson /9 1
Skilled in calculating the week /92
Clever calculation in stall /92
Climb stairs /93
Hens lay eggs /93
Insect wings and legs /94
Travel around the world /95
Bright Moon on the Sea /96
Castle Peak and Clear Water /97
Nine-color floor tile /98
Countdown Poem in The Journey to the West /98
Apple distribution in kindergarten/100
Salt carrier/10 1
Ball sales/102
Qimen Orchard/103
How many Jinshan Yinshan/103
Find a pattern and fill in the numbers/104
Mystery of the stars/105
The geese by the pond/105
Fill in two and fill in three/107
Fill in three sides/108
Fun math game/1 10
Invisible man/1 10
Tangram/1 1 1
Set of three/1 13
Poker game/1 15
Ants and the Magic Circle/1 16
Tetris/1 17
Put coins/1 19
Guess/1 19
Ten/12 1
See who gets the most/122
Interesting Bicycle/123
Spelling formula/125
Guess the number in the square matrix/127
Guess the hour/128
Patch/129
Grab 30/130
3、6、9/ 130
Found number/13 1
Match/132
A verbal game/134
Visit the game/135
Poker Triangle/137
Match transfer game/138
Interesting mathematical maze/14 1
Matching equation/14 1
Jinghekou/142
One bow changes two mouths/143
Enlarge the total area/144
Hat maze/146
Mask/147
Get lost at home/148
Blackjack/149
Vertical riddle/150
Horizontal riddle/158
Interesting intelligence training/16 1
Observation drawing/16 1
Observe the filling quantity/166
Brainstorm /t83
Wonderful hand/194