Speed ​​calculation, reserve education kid the fu
 

1. ten by ten: ,Lacoste Tennis Trainers
formulas: the pate 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,Womens Lacoste Observe Trainers, not use the 0 digit placeholder.

2. head the same, complementary tail (tail join up to 10):
formulas: a first add 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, the same as the other multiplier:
formulas: a first add 1 to the head by head,Lacoste Prep CB Trainers, tail by tail.
Example: 37 × 44 =?
solution: 3 +1 = 4
4 × 4 = 16
7 × 4 = 28
; 37 × 44 = 1628
Note: a bit multiply,Womens Lacoste Arin Trainers, not use the 0 digit placeholder.

4. dozens of dozens of one by one:
formulas: head by head, head plus 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: amount of nailed fate, 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,Lacoste Radiate Croc Trainers, respectively, in the sum of
11 × 23125 = 254375
Note: and over ten to get into one.

6. dozen by anyone number:
formulas: Second Take namely no the premier destiny of several trends, the premier numeral multiplied along the ingredient after the second element of each number,Lacoste Shoes, and the afterward digit, another 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 to get into one.