Speed ​​calculation, afterward education kid keep
 

1. ten by ten:
formulas: the pate by brain,GHD Purple Butterfly 2011, tail plus tail,GHD IV Dark Straighteners, tail by tail.
Example: 12 × 14 =?
solution: 1 × 1 = 1
2 +4 = 6
2 × 4 = 8
12 × 14 = 168
Note: a bit multiply,GHD Straighteners NZ, not use the 0 digit placeholder.

2. head the same,GHD Straighteners, complementary tail (tail add up to 10):
formulas: a first multiplication 1 to the head by head,GHD MK4 Gold Straighteners, 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 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, not use the 0 digit placeholder.

4. dozens of dozens of an 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: sum of fixed 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, 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 not the first destiny of several trends, the first numeral multiplied at the ingredient back the second factor of each number,GHD Rare Straighteners, and the afterward numeral, again lacking.
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.

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