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Thu Mar 28, 2013, 10:30 PM

And when you add the two digits together you get, you guessed it, the number NINE!




Nine is magic!

8 replies, 764 views

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Reply And when you add the two digits together you get, you guessed it, the number NINE! (Original post)
MrScorpio Mar 2013 OP
Art_from_Ark Mar 2013 #1
MrScorpio Mar 2013 #2
Aristus Mar 2013 #3
In_The_Wind Mar 2013 #4
bluesbassman Mar 2013 #5
Ptah Mar 2013 #6
Arctic Dave Mar 2013 #7
talkingmime Mar 2013 #8

Response to MrScorpio (Original post)

Thu Mar 28, 2013, 10:35 PM

1. I figured that out for myself

back in the 3rd grade or so.

And all numbers whose digits add up to multiples of 3, are divisible by 3. And all even numbers like that, are divisible by 6 as well

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Response to Art_from_Ark (Reply #1)

Thu Mar 28, 2013, 10:40 PM

2. Same here

The person who made this must have had a shitty math teacher

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Response to MrScorpio (Original post)

Thu Mar 28, 2013, 10:44 PM

3. And the order of the digits in the product reverse in rising sequence.

That's a cool thing I noticed years ago...

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Response to MrScorpio (Original post)

Thu Mar 28, 2013, 10:46 PM

4. 8 & 1

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Response to MrScorpio (Original post)

Thu Mar 28, 2013, 11:33 PM

5. Number nine, number nine, number nine, number nine, number nine...

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Response to MrScorpio (Original post)

Thu Mar 28, 2013, 11:41 PM

6. My grandfather showed this to me in 1955.

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Response to MrScorpio (Original post)

Fri Mar 29, 2013, 01:04 AM

7. Sad story.

 

When i moved to a new school district my junior year in high school they lost all my school transcripts and I had to take ALL remedial courses for a semester. Reading, Math, English.

They were teaching this in the class. Sad part, there were kids in the class that could not do basic math. Same thing in the other classes.

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Response to MrScorpio (Original post)

Fri Mar 29, 2013, 10:44 AM

8. My math teacher actually DID teach me that - and I still use the checksum.

 

I taught it to my kids when they were practicing the tables.

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