Hello, how are you?

There are amazing secrets or magic in mathematical numbers such as 1, 11, 111, …., 111111111, 8, and 9, etc. The following is one of those. Hope that math fans or those who are interested in math teaching and learning enjoy it.

———————————————————————————————

1 x 8 + 1 = 9

12 x 8 + 2 = 98

123 x 8 + 3 = 987

1234 x 8 + 4 = 9876

12345 x 8 + 5 = 987 65

123456 x 8 + 6 = 987654

1234567 x 8 + 7 = 9876543

12345678 x 8 + 8 = 98765432

123456789 x 8 + 9 = 987654321

——————————————————————————————–

0 x 9+1=1

1 x 9 + 2 = 11

12 x 9 + 3 = 111

123 x 9 + 4 = 1111

1234 x 9 + 5 = 11111

12345 x 9 + 6 = 111111

123456 x 9 + 7 = 1111111

1234567 x 9 + 8 = 11111111

12345678 x 9 + 9 = 111111111

123456789 x 9 +10= 1111111111

——————————————————————————————–

9 x 9 + 7 = 88

98 x 9 + 6 = 888

987 x 9 + 5 = 8888

9876 x 9 + 4 = 88888

98765 x 9 + 3 = 888888

987654 x 9 + 2 = 8888888

9876543 x 9 + 1 = 88888888

98765432 x 9 + 0 = 888888888

———————————————————————————————

1 x 1 = 1

11 x 11 = 121

111 x 111 = 12321

1111 x 1111 = 1234321

11111 x 11111 = 123454321

111111 x 111111 = 12345654321

1111111 x 1111111 = 1234567654321

11111111 x 11111111 = 123456787654321

111111111 x 111111111 = 12345678987654321

———————————————————————————————

If YOU have a moment, please answer this simple question:

Take a piece of paper from your computer printer, 8.5*11 in size, you agree that there are four (4) corners for the paper which is rectangle shape, now take a scissor and cut one (1) corner off the paper by straight line (only once for each result), how many corners left on the remain paper?

Very easy if you actually do it!

Only a tiny trick in it, Good Luck!

Happy Saturday Evening! ;) :) ;)

PS: You can also fold it for one time to get a result, there are two solutions,

If you divide the rectangle into exactly two equal pieces of triangular paper, then you get 4-1=3, 3 corners,

But if you cut out one corner and get two pieces of paper, with a small triangle removed, you get 4-2=5 corners,amazing math humor, isn’t it?

Good job, everyone, everyone got 5 corners, the other case is a trick, as I mentioned…;) :) ;)

—————————————————————————————————————————————————

**Math Posts in Blogs: **

Childish Sweetheart:

http://kumikomae.blogspot.com/2010/01/math-equations-humanity.html

Richard Wiseman Blog**: **

http://richardwiseman.wordpress.com/2010/01/15/its-the-friday-puzzle-42/

Math teacher: http://manlovesmath.blogspot.com/

Bananaz: http://bananazpeople.blogspot.com/

Teach :<) Happy: http://techhappy.wordpress.com/2010/01/01/46-stellar-math-sites-for-kids-youd-be-obtuse-not-to-visit/

Math Baseball: http://www.funbrain.com/funbrain/math/

Math faculty in California: http://eaglebach.wordpress.com/

Problem of the Fortnight: http://eaglebach.wordpress.com/2009/10/26/problem-of-the-fortnight/

Coffee cup adventures: http://yanangski.wordpress.com/2010/01/17/doing-the-math/#respond

That little Notebook’s Weblog : http://thatlittlenotebook.wordpress.com/2010/01/16/my-brothers-wisdom/

Math humor:

http://www.xkcd.com/179/