Quick enumeration ; ; ; ; tin instruct children
 

. ten by ten:
formulas: the head by head,GHD Precious Gift Set, tail plus tail,GHD Rare Straighteners, tail by tail.
Example: 12 × 14 =?
solution: 1 × 1 = 1
2 +4 = 6
2 × 4 = 8
12 × 14 = 168
Note: a bit amplify,GHD IV Styling Set, not use the 0 number placeholder.

2. head the same, complementary tail (tail add up to 10):
formulas: a first add 1 to the head by head,GHD Green Straighteners, tail by tail.
Example: 23 × 27 =?
Solution: 2 +1 = 3
2 × 3 = 6
3 × 7 = 21
23 × 27 = 621
Note: a bit multiply,GHD Red Butterfly 2011, not use the 0 digit placeholder.

3. complementary premier multiplier, the same for the additional multiplier:
formulas: a first increase 1 apt 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 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: sum of nailed fate, and 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 Classic Straighteners, respectively, in the sum of
11 × 23125 = 254375
Note: and over ten to obtain into 1.

6. dozen at anybody number:
formulas: Second Take is not the first fate of several trends, the first digit multiplied by the factor back the second factor of every number, plus the afterward digit, another missing.
Example: 13 × 326 =?
solution: 13 bits namely 3
3 × 3 +2 = 11
3 × 2 +6 = 12
; 3 × 6 = 18
13 × 326 = 4238
Note: and over ten to get into one.