Speed ​​calculation, later education kid keep

1. More than ten by ten:
formulas: the head by head, tail plus tail,PULSERA BLANCA CON PORTUGAL, tail by tail.
Example: 12 × 14 =?
solution: 1 × 1 = 1
2 +4 = 6
2 × 4 = 8
12 × 14 = 168
Note: a morsel multiply, not use the 0 number placeholder.

2. head the same, complementary tail (tail add up to 10):
formulas: a first increase 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 multiply, not use the 0 digit placeholder.

3. complementary first multiplier,PULSERA CAMUFLAJE CON LOGO XB, the same for the other 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,PULSERA AZUL CON LOGO XB, not use the 0 digit placeholder.

4. dozens of dozens of one along one:
formulas: pate by pate, head and head, tail by tail.
Example: 21 × 41 =?
solutions: 2 × 4 = 8
2 +4 = 6
1 × 1 = 1
; 21 × 41 = 861

5.11 by any number:
formulas: sum of fixed fate,PULSERA TRANSPARENTE CON BANDERA, and the middle of the drop-down.
Example: 11 × 23125 =?
Solution: 2 +3 = 5
3 +1 = 4
1 +2 = 3
; 2 +5 = 7
2 and 5,PULSERA NEGRA CON ARGENTINA, respectively, in the amount of
11 × 23125 = 254375
Note: and over ten to get into one.

6. dozen by any number:
formulas: Second Take is not the first destiny of several trends, the first digit multiplied by the factor backward the second factor of every digit,PULSERA BLANCE CON ESPANA, plus the afterward digit, repeatedly missing.
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 ten apt obtain into one.
------------------------------------------