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What do you mean by "99"?
9999 is a multiplication formula. Now we are learning "Xiao Jiu wine"

multiplication table

The multiplication of 1 is:

1× 1= 1 1×2=2 1×3=3 1×4=4 1×5=5 1×6=6 1×7=7 1×8=8 1×9=9

1× 10= 10 1× 1 1= 1 1 1× 12= 12 1× 13= 13 / kloc-0/× 14= 14 1× 15= 15

1× 16= 16 1× 17= 17 1× 18= 18 1× 19= 19

Twice the multiplication is:

2×2=4 2×3=6 2×4=8 2×5= 10 2×6= 12 2×7= 14 2×8= 16 2×9= 18

2× 10=20 2× 1 1=22 2× 12=24 2× 13=26 2× 14=28 2× 15=30

2× 16=32 2× 17=34 2× 18=36 2× 19=38

The multiplication of 3 times is:

3×3=9 3×4= 12 3×5= 15 3×6= 18 3×7=2 1 3×8=24 3×9=27

3× 10=30 3× 1 1=33 3× 12=36 3× 13=39 3× 14=42 3× 15=45

3× 16=48 3× 17=5 1 3× 18=54 3× 19=57

The multiplication of 4 times is:

4×4= 16 4×5=20 4×6=24 4×7=28 4×8=32 4×9=36

4× 10=40 4× 1 1=44 4× 12=48 4× 13=52 4× 14=56 4× 15=60

4× 16=64 4× 17=68 4× 18=72 4× 19=76

The multiplication operation of 5 times is:

5×5=25 5×6=30 5×7=35 5×8=40 5×9=45

5× 10=50 5× 1 1=55 5× 12=60 5× 13=65 5× 14=70 5× 15=75

5× 16=80 5× 17=85 5× 18=90 5× 19=95

The multiplication operation of 6 times is:

6×6=36 6×7=42 6×8=48 6×9=54

6× 10=60 6× 1 1=66 6× 12=72 6× 13=78 6× 14=84 6× 15=90

6× 16=96 6× 17= 102 6× 18= 108 6× 19= 1 14

The multiplication operation of 7 times is:

7×7=49 7×8=56 7×9=63 7× 10=70

7× 1 1=77 7× 12=84 7× 13=9 1 7× 14=98 7× 15= 105

7× 16= 1 12 7× 17= 1 19 7× 18= 126 7× 19= 133

Eight times the multiplication is:

8×8=64 8×9=72 8× 10=80

8× 1 1=88 8× 12=96 8× 13= 104 8× 14= 1 12 8× 15= 120

8× 16= 128 8× 17= 136 8× 18= 144 8× 19= 152

The multiplication operation of 9 times is:

9×9=8 1 9× 10=90

9× 1 1=99 9× 12= 108 9× 13= 1 17 9× 14= 126 9× 15= 135

9× 16= 144 9× 17= 153 9× 18= 162 9× 19= 17 1

10 is multiplied by:

10× 10= 100 10× 1 1= 1 10 10× 12= 120 10× 13= 130 10× 14= 140

10× 15= 150 10× 16= 160 10× 17= 170 10× 18= 180 10× 19= 190

1 1 is multiplied as follows:

1 1× 1 1= 12 1 1 1× 12= 132 1 1× 13= 143 1 1× 14= 154 1 1× 15= 165

1 1× 16= 176 1 1× 17= 187 1 1× 18= 198 1 1× 19=209

12 is multiplied by:

12× 12= 144 12× 13= 156 12× 14= 168 12× 15= 180

12× 16= 192 12× 17=204 12× 18=2 16 12× 19=228

13 is multiplied by:

13× 13= 169 13× 14= 182 13× 15= 195

13× 16=208 13× 17=22 1 13× 18=234 13× 19=247

14 is multiplied by:

14× 14= 196 14× 15=2 10 14× 16=224

14× 17=238 14× 18=252 14× 19=266

15 is multiplied by:

15× 15=225 15× 16=240 15× 17=255 15× 18=270 15× 19=285

16 is multiplied by:

16× 16=256 16× 17=272 16× 18=288 16× 19=304

17 is multiplied by:

17× 17=289 17× 18=306 17× 19=323

18 is multiplied by:

18× 18=324 18× 19=342

19 is multiplied by:

19× 19=36 1