Too many wrong, educate kid apt reserve after

1. dozen by dozen : ,Lacoste Gravitate Shoes
formulas : the head by head , tail plus tail, tail by tail .
Example : 12 × 14 =?
solution : 1 × 1 = 1
2 +4 = 6
2 × 4 = 8
12 × 14 = 168
Note : a bit multiply, not to use the 0 digit placeholder .

2. head the same ,Lacoste Swerve Lace Shoes, complementary tail (tail amount equal to 10):
formulas: a first increase 1 apt the pate along head ,Lacoste Carnaby Shoes, tail at tail .
Example : 23 × 27 =?
solution : 2 +1 = 3
2 × 3 = 6
3 × 7 = 21
23 × 27 = 621
Note: a morsel amplify, no to double-digit with the 0 placeholder .

3. the first multiplier complementary , the same as dissimilar multiplier :
formulas: a first add 1 to the head by head ,Lacoste Shoes, tail by tail .
Example : 37 × 44 =?
solution : 3 +1 = 4
4 × 4 = 16
7 × 4 = 28
37 × 44 = 1628
Note: a bit multiply, not to use the 0 numeral placeholder .

4. dozens of dozens of one by one :
formulas : the head by head , head plus head, tail by tail .
Example : 21 × 41 =?
solution : 2 × 4 = 8
2 +4 = 6
1 × 1 = 1
21 × 41 = 861

5.11 by any number :
formulas : the whereabouts of the nailed end to end , in the medium of the drop-down.
Example : 11 × 23125 =?
solution : 2 +3 = 5
3 +1 = 4
1 +2 = 3
2 +5 = 7
; 2 and 5 ,Womens Lacoste Arin Shoes, respectively, in the starting and end
11 × 23125 = 254375
Note : and over 10 to enter 1 .

6. dozen by anybody number :
formulas : the whereabouts of the second movement is not the first multiplier ,Mens Lacoste, multiplying the first ingredient a bit back the second factor of each digit , plus the next number , anew falling .
Example : 13 × 326 =?
solution : 13 bits is 3
3 × 3 +2 = 11
3 × 2 +6 = 12
3 × 6 = 18
13 × 326 = 4238
Note : and over 10 to enter a