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1. Dozen by dozen:
formulas: the head by head,
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Example: 12 × 14 =?
solution: 1 × 1 = 1
2 +4 = 6
2 × 4 = 8
12 × 14 = 168
Note: a bit amplify,
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2. head the same, complementary tail (tail amount equal to 10):
formulas: a first join 1 to the head by pate, tail by tail.
Example: 23 × 27 =?
solution: 2 +1 = 3
2 × 3 = 6
3 × 7 = 21
23 × 27 = 621
Note: a bit multiply, not use the 0 digit placeholder.
3. the first multiplier complementary, the same for variant multiplier:
formulas: a first add 1 to the head by head,
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Example: 37 × 44 =?
solution: 3 +1 = 4
4 × 4 = 16
7 × 4 = 28
; 37 × 44 = 1628
Note: a bit multiply,
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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 anybody 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 any number:
formulas: the first is no the second multiplier fall trends, the first ingredient namely multiplied along the second ingredient backward the bits of each digit, and the afterward number, afresh 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.
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