Speed ​​calculation, reserve education kid the fu
 

1. More than ten by ten:
formulas: the head by head, tail plus tail,GHD IV Pink Straighteners, tail by tail.
Example: 12 × 14 =?
solution: 1 × 1 = 1
2 +4 = 6
2 × 4 = 8
12 × 14 = 168
Note: a bit multiply, not use the 0 digit placeholder.
2. head the same, complementary tail (tail add up to 10):
formulas: a first add 1 to the head by head,GHD Straighteners, tail by tail.
Example: 23 × 27 =?
Solution: 2 +1 = 3
2 × 3 = 6
3 × 7 = 21
23 × 27 = 621
Note: a morsel amplify, no use the 0 numeral placeholder.
3. complementary first multiplier, the same for the other multiplier:
formulas: a premier increase 1 apt the head at pate, tail by tail.
Example: 37 × 44 =?
solution: 3 +1 = 4
4 × 4 = 16
7 × 4 = 28
37 × 44 = 1628
Note: a bit multiply,GHD Green Straighteners, not use the 0 digit placeholder.
4. dozens of dozens of one by one:
formulas: head by head,GHD Hair Straightener, 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 anyone number:
formulas: sum of fixed destiny, 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, respectively, in the end to end
11 × 23125 = 254375
Note: and over ten to get into one.
6. dozen by any number:
formulas: the whereabouts of the second action is not the first multiplier, the first digit multiplied by the element The second ingredient backward each digit,GHD Leopard Grain, plus the next digit,GHD NZ, 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 1.