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+2
238
3
avatar+445 

111111111*111111111=12345678987654321

11111111*11111111=123456787654321

1111111*1111111=1234567654321

111111*111111=12345654321

11111*11111=123454321

1111*1111=1234321

111*111=12321

11*11=121

1*1=1

 

I thought this was interesting how this works.

ZZZZZZ  Jun 1, 2017
edited by ZZZZZZ  Jun 2, 2017
Sort: 

3+0 Answers

 #1
avatar+5555 
+1

That is pretty cool Z !!!!  laugh👍

 

Also, you might have seen that trick about how to remember the multiples of 9 before....

One time I wondered what would it do if I just continued the list past 90.

 

The first column counts up, the second column counts down. Whenever you reach zero in the second column, repeat the number in the first column.

 

0    9

1    8

2    7

3    6

4    5

5    4

6    3

7    2

8    1

9    0

 

9    9

10  8

11  7

12  6

13  5

14  4

15  3

16  2

17  1

18  0

 

18  9

19  8

20  7

21  6

22  5

23  4

...

 

Let's fast forward to " 909 "

 

...

90  9

91  8

92  7

93  6

94  5

95  4

96  3

97  2

98  1

99  0

 

99   9

100 8

101 7

102 6

103 5

 

...It still works !!  I don't know why, but for some reason I find this neat LOL laughsmiley

hectictar  Jun 2, 2017
 #2
avatar+445 
+3

Also...

1/9=.111111111111111111...

2/9=.2222222222222222...

...

24/99=.242424242424242424...

123/999=.123123123123123...

123456789/999999999=.123456789123456789123456789123456789...

ZZZZZZ  Jun 2, 2017
edited by ZZZZZZ  Jun 2, 2017
 #3
avatar+6900 
+1

Also, any positive integer exponent of 25 ends in 25 and any positive integer exponent of 76 ends in 76

25^1 = 25

25^2 = 625

25^3 = 15625

25^4 = 390625

and so on...

-----------------------

76^1 = 76

76^2 = 5776

76^3 = 438976

76^4 = 33362176

and so on...

MaxWong  Jun 3, 2017

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