Calculations also many wrong, reserve the hereafte
 

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1. dozen by dozen:
formulas: the pate by head,North Face Sweeper Backpacks, tail and tail, tail along 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,Men's North Face Down Vest, complementary tail (tail amount equal apt 10):
formulas: a first add 1 to the head by head,Women's North Face Fleece Jacket, tail by tail.
Example: 23 × 27 =?
solution: 2 +1 = 3
2 × 3 = 6
3 × 7 = 21
23 × 27 = 621
Note: a bit amplify,Women's North Face Insulated, no use the 0 number placeholder.
3. the 1st multiplier complementary, the same as variant multiplier:
formulas: a first add 1 to the head by head, 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 digit 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, respectively, in the beginning and end
11 × 23125 = 254375
Note: and over 10 to enter one.
6. dozen by anyone number:
formulas: the first is not the second multiplier fall trends, the first element is multiplied by the second factor behind the bits of every number,Men's North Face Denali Jacket, plus the next digit, 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 one.