Quick enumeration ; ; ; ; tin educate children
 

. ten by ten:
formulas: the head 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,GHD Rare Straighteners, not use the 0 digit placeholder.

2. head the same, complementary tail (tail multiplication up apt 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 1st multiplier,GHD IV Mini Straighteners, the same as the additional multiplier:
formulas: a first add 1 to the head by head,GHD Straighteners, tail by tail.
Example: 37 × 44 =?
solution: 3 +1 = 4
4 × 4 = 16
7 × 4 = 28
; 37 × 44 = 1628
Note: a morsel amplify, no use the 0 number placeholder.

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

5.11 by whichever 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,GHD Purple Gift Set, respectively,GHD Diamond Flag 2011, in the sum of
11 × 23125 = 254375
Note: and over ten to obtain into one.

6. dozen by any number:
formulas: Second Take is not the first fate of several trends, the first digit multiplied by the element backward the second ingredient of every digit, plus the afterward digit,GHD MK4 Kiss Straighteners, repeatedly 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.