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enumeration was surprising, reserve later teaching children! ! ! Jade arrange
1. Dozen by dozen:
formulas: the head by head,
New GHD Professional Pink Straighteners, tail plus tail,
GHD Rare Styler Straighteners, 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, complementary tail (tail sum equal to 10):
formulas: a first multiplication 1 to the head by head, tail by tail.
Example: 23 × 27 =?
solution: 2 +1 = 3
2 × 3 = 6
3 × 7 = 21
23 × 27 = 621
Note: a bit amplify,
GHD Dark Styler Straighteners, not use the 0 number placeholder.
3. the first multiplier complementary,
GHD NZ, the same as distinct 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 brain by pate, brain and head, tail along tail.
Example: 21 × 41 =?
solution: 2 × 4 = 8
2 +4 = 6
1 × 1 = 1
; 21 × 41 = 861
5.11 by whichever number:
formulas: the whereabouts of the fixed 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,
GHD Pink Limited Edition, respectively, in the starting and end
11 × 23125 = 254375
Note: and over 10 apt enter an.
6. dozen by any number:
formulas: the first is not the second multiplier fall trends, the first element is multiplied by the second element behind the bits of every digit,
GHD Kiss Styler Straighteners, plus the next digit, 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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