the thread about nothing...

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how to multiply any number by 11 in your head:

e.g. 25*11

put a spece between 2 and 5...

add the two number = 7

put tthe 7 in the space: 275

77???

7...7

7+7=14

(7+1) 4 (7): 847

97???

9...7

9+7=16

(9+1) 6 (7): 1067


Wrong.. the best ay to multiply by 11 in your head... multiply the number by 10, the add the number to the outcome...

5 x 11 = 55

5x 10 = 50 50 + 5 = 55



130 x 11 =1430

130 x 10 = 1300 1300 + 130 = 1430
 
how to multiply any number by 11 in your head:

e.g. 25*11

put a spece between 2 and 5...

add the two number = 7

put tthe 7 in the space: 275

77???

7...7

7+7=14

(7+1) 4 (7): 847

97???

9...7

9+7=16

(9+1) 6 (7): 1067
That's why there are calculatorz dood
 
add all the numbers up from 1-100 in your head?

1      2     3    4..........50

100  99   98  97  ........51

101  101 101.............101 so 101*50=5050
 
 
how to multiply any number by 11 in your head:

e.g. 25*11

put a spece between 2 and 5...

add the two number = 7

put tthe 7 in the space: 275

77???

7...7

7+7=14

(7+1) 4 (7): 847

97???

9...7

9+7=16

(9+1) 6 (7): 1067
That's why there are calculatorz dood
square any number that ends with 5?

1. the answer begins by multiplying the first digit by the next higher digit

2. the answer ends in 25

25^2?

2*3=6

so...625!

75^2

7*8=56 25

so 5625!
 
 
how to multiply any number by 11 in your head:

e.g. 25*11

put a spece between 2 and 5...

add the two number = 7

put tthe 7 in the space: 275

77???

7...7

7+7=14

(7+1) 4 (7): 847

97???

9...7

9+7=16

(9+1) 6 (7): 1067

Wrong.. the best ay to multiply by 11 in your head... multiply the number by 10, the add the number to the outcome...

5 x 11 = 55

5x 10 = 50 50 + 5 = 55



130 x 11 =1430

130 x 10 = 1300 1300 + 130 = 1430
you're adding in an extra step of addition which can get quite complicated with bigger number...this is more intuative.
 
 
how to multiply any number by 11 in your head:


e.g. 25*11


put a spece between 2 and 5...


add the two number = 7


put tthe 7 in the space: 275


77???


7...7


7+7=14


(7+1) 4 (7): 847


97???


9...7


9+7=16


(9+1) 6 (7): 1067



Wrong.. the best ay to multiply by 11 in your head... multiply the number by 10, the add the number to the outcome...


5 x 11 = 55


5x 10 = 50 50 + 5 = 55




130 x 11 =1430


130 x 10 = 1300 1300 + 130 = 1430
you're adding in an extra step of addition which can get quite complicated with bigger number...this is more intuative.

Not in my head.. Your way just confuses the **** outta me :lol:
 
 
 
how to multiply any number by 11 in your head:

e.g. 25*11

put a spece between 2 and 5...

add the two number = 7

put tthe 7 in the space: 275

77???

7...7

7+7=14

(7+1) 4 (7): 847

97???

9...7

9+7=16

(9+1) 6 (7): 1067

Wrong.. the best ay to multiply by 11 in your head... multiply the number by 10, the add the number to the outcome...

5 x 11 = 55

5x 10 = 50 50 + 5 = 55



130 x 11 =1430

130 x 10 = 1300 1300 + 130 = 1430
you're adding in an extra step of addition which can get quite complicated with bigger number...this is more intuative.
I use Celtics way in Math class
 
 
 
 
how to multiply any number by 11 in your head:

e.g. 25*11

put a spece between 2 and 5...

add the two number = 7

put tthe 7 in the space: 275

77???

7...7

7+7=14

(7+1) 4 (7): 847

97???

9...7

9+7=16

(9+1) 6 (7): 1067

Wrong.. the best ay to multiply by 11 in your head... multiply the number by 10, the add the number to the outcome...

5 x 11 = 55

5x 10 = 50 50 + 5 = 55



130 x 11 =1430

130 x 10 = 1300 1300 + 130 = 1430
you're adding in an extra step of addition which can get quite complicated with bigger number...this is more intuative.
I use Celtics way in Math class
only one step of addistion...you're busy multiplying and adding... 

when youre selling 11 bricks for $7500 each you have to be able to do the math quick! word to beh!
 
 
 
 
how to multiply any number by 11 in your head:


e.g. 25*11


put a spece between 2 and 5...


add the two number = 7


put tthe 7 in the space: 275


77???


7...7


7+7=14


(7+1) 4 (7): 847


97???


9...7


9+7=16


(9+1) 6 (7): 1067



Wrong.. the best ay to multiply by 11 in your head... multiply the number by 10, the add the number to the outcome...


5 x 11 = 55


5x 10 = 50 50 + 5 = 55




130 x 11 =1430


130 x 10 = 1300 1300 + 130 = 1430
you're adding in an extra step of addition which can get quite complicated with bigger number...this is more intuative.
I use Celtics way in Math class
only one step of addistion...you're busy multiplying and adding... 

when youre selling 11 bricks for $7500 each you have to be able to do the math quick! word to beh!

Naw, it's mad quick in my head.... I don't even think bout it, just happens like that... :D
 
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