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First, the two-digit by digit.
1. ten by ten:
formulas: the head by head, tail plus tail,christian louboutin sneakers 2010, 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,mbt price, complementary tail (tail add up to 10):
formulas: a first add 1 to the pate by brain, 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,supra footwear online store, the same as the additional 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 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 whichever number:
formulas: amount of nailed fate, and the navel of the drop-down.
Example: 11 × 23125 =?
Solution: 2 +3 = 5
3 +1 = 4
1 +2 = 3
; 2 +5 = 7
2 and 5, respectively,supra skateboarding shoes qq进门效果代码全解（15号更新）, in the sum of
11 × 23125 = 254375
Note: and over ten to get into one.

6. dozen by any number:
formulas: the whereabouts of the second movement is not the premier multiplier, the first digit multiplied by the ingredient backward the second element of each number, plus the afterward digit, falling afresh.
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.
double-digit add above mathematics,buy jimmy choo, The so-called 3, accurate equal to the sum of 10,54个冷笑话，看到第二个我就冷死了。。。, I told him, multiplying the number like this, in fact, there is a pattern. Two-digit number is the product of two digits for the post thanks to a number less than 10, ten digits with fill 0; either take the same number of one of the ten plus 1 multiplied, the outcome is the thousands of Deshu bit and the hundred. Specific to the example above, 67 × 63,7 × 3 = 21, it is thanks to a number of 21 the final two; 6 × (6 +1) = 6 × 7 = 42, it is thanks to a number of the first two of 42 comprehensive up, 67 × 63 = 4221. Like, 15 × 15 = 225,89 × 81 = 7209,64 × 66 = 4224,92 × 98 = 9016. I told him this rapid calculation small In the I told him namely the so-called is 5, the results of ten-digit just 4 +6 = 10. It's enumeration rule is that the two of you the same number as the product of the number of digits after thanks to a number of less than 10, fill in the ten on 0; two-digit add with dozens of the same digits, The outcome is that thanks to a number of one hundred and thousand digits. Specific to the above example, 45 × 65,5 × 5 = 25, it is thanks to a number of post 25 double-digit, 4 × 6 +5 = 29, it is thanks to a number of the front chapter 29, therefore, 45 × 65 = 2925. Like, 11 × 91 = 1001,83 × 23 = 1909,74 × 34 = 2516,97 × 17 = 1649.
for ease of us to know the universal decree of double-digit multiplication, there will be via characteristic examples. By comparing the results of a large number of double-digit multiplication, I double-digit multiplication result is divided into three parts, a bit, ten, ten or more that one hundred and thousands. (Maximum two-digit multiplication is not more than 10,000, so the most tin only be to the thousands) is one example: 42 × 56 = 2352

which, thanks to a number of digits is decided, catching the digit 2 product of the mantissa number for the Deshu the single digits. Specific to the sample above, 2 × 6 = 12, where 2 is thanks to a number of mantissa, 1 bit into the number;
thanks to a number of ten digits is decisive, taking the number of bits of two and ten, respectively, Cross multiply and join a bit into the digit sum of the mantissa, for thanks to a number of ten digits. Specific to the example above, 2 × 5 +4 × 6 +1 = 35, which, thanks to a number 5 for the ten-digit, 3 for the ten decimal;
Deshu the rest of the usage is determined, taking the number two the product of ten and ten-digit bin number and is thanks to a number of one hundred or a thousand. Specific to the example above, 4 × 5 +3 = 23. The 2 and 3, respectively thanks to a number of the thousands digit and the hundreds.

Therefore,mbt white, 42 × 56 = 2352. Another example, 82 × 97, in accordance with the above calculation method, first identified thanks to a number of digits,爱, 2 × 7 = 14, then thanks to a number of bits ought be 4; then determined thanks to a number of ten-digit, 2 × 9 +8 × 7 +1 = 75, then thanks to a number of ten centre 5; last calculated the rest of Deshu, 8 × 9 +7 = 79, therefore, 82 × 97 = 7954. Similarly, using this algorithm, it is cozy to penetrate that all the product of two-digit multiplication.
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