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