## Magical Number Nine (9) On Math Monday

Wow, It is Monday.  I decide to make Mondays Math Monday!

I miss Math, let’s discover the magic in number nine (9).

As you do “Times Table By 9” , you may notice that the digits always add up to “9”…

Let’s check it out:

1*9=9  –>0+9=9

2*9=18  –>1+8=9

3*9=27  –>2+7=9

4*9=36  –>3+6=9

5*9=45  –>4+5=9

6*9=54  –>5+4=9

7*9=63  –>6+3=9

8*9=72  –>7+2=9

9*9=81  –>8+1=9

10*9=90  –>9+0=9

Isn’t this number game FUN?

Does it work for larger numbers? You may wonder.

Yes, this works for any number multiples 9….

Say: 11*9=99  –>9+9=18  –>1+8=9

100*9=900  –>9+0+0=9

211*9=1899  –>1+8+9+9=27  –>2+7=9

1005*9=9045  –>9+0+4+5=18  –>1=8=9

42001*9=378,009  –>3+7+8+0+0+9=27  –>2+7=9

Amazing math facts! :).  I hope that YOU have FUN learning and discovering the magical number nine (9) on Math Monday.

If interested, please do an example to confirm this fact above:

___ *9=_____,  –>___+___=____,

Thank YOU for sharing the wisdom of magical numbers in nine (9).  Happy Math Monday to YOU All! 🙂 🙂

Happy Martin Luther King’s Day to You all Who Celebrate This Special Day!

Math Blogs:

Richard Wiseman Blog:

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

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

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

Math faculty in California:  http://eaglebach.wordpress.com/2009/12/08/problem-of-the-fortnight-2/

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

Main page: http://eaglebach.wordpress.com/