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How many 9's between 1-100?

• Thread starter SandEagle
• Start date Jul 26, 2009

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SandEagle

Lifer

Aug 4, 2007 16,809 13 0 gah, i had to redo this many times... try figuring it out without writing anything down.

Chaotic42

Lifer

Jun 15, 2001 35,328 2,468 126 10 for each number which ends in 9 9 more for each number which begins with 9 I'm going with 19. L

lyssword

Diamond Member

Dec 15, 2005 5,630 25 91 same question as how many 7's are between 1-100 20

SandEagle

Lifer

Aug 4, 2007 16,809 13 0

Originally posted by: Chaotic42 10 for each number which ends in 9 9 more for each number which begins with 9 I'm going with 19. Click to expand...

wrong

Chaotic42

Lifer

Jun 15, 2001 35,328 2,468 126

Originally posted by: SandEagle wrong Click to expand...

Ah, never mind. I'm an idiot.

Poulsonator

Golden Member

Aug 19, 2002 1,597 0 76

Originally posted by: Chaotic42

Originally posted by: SandEagle wrong Click to expand...

Well, it is Sunday night so 09 19 29 39 49 59 69 79 89 99 90 91 92 93 94 95 96 97 98 What am I missing here? Click to expand...

You're missing a key part of the question. How many 9's are there inbetween 1-100? It's 20 as you forgot to count the nine that begins 99.

dahunan

Lifer

Jan 10, 2002 18,191 3 0

Originally posted by: SandEagle

Originally posted by: Chaotic42 10 for each number which ends in 9 9 more for each number which begins with 9 I'm going with 19. Click to expand...

wrong Click to expand...

got me too 20.. right?

pontifex

Lifer

Dec 5, 2000 43,804 46 91 0. I don't see any 9s between "1-100"

GeekDrew

Diamond Member

Jun 7, 2000 9,099 19 81 there are two 9's in 99, chaotic42.

IronWing

No Lifer

Jul 20, 2001 73,633 35,413 136 Every last one of them.

Chaotic42

Lifer

Jun 15, 2001 35,328 2,468 126

Originally posted by: Poulsonator You're missing a key part of the question. How many 9's are there inbetween 1-100? It's 20 as you forgot to count the nine that begins 99. Click to expand...

Yup. It's 20 as long as he's talking integers.

Arkaign

Lifer

Oct 27, 2006 20,736 1,379 126

Originally posted by: pontifex 0. I don't see any 9s between "1-100" Click to expand...

:laugh:

SandEagle

Lifer

Aug 4, 2007 16,809 13 0

Originally posted by: pontifex 0. I don't see any 9s between "1-100" Click to expand...

this work too if you're a smartass T

txrandom

Diamond Member

Aug 15, 2004 3,773 0 71 9, there is only one.

DrPizza

Administrator Elite Member Goat Whisperer

Mar 5, 2001 49,601 167 111 www.slatebrookfarm.com Forget about 100 for a moment, and write the units as 01, 02, etc., and start with 00. So, 00 to 99 100 numbers, each two digits each, for a total of 200 digits. Each digit occurs with the same frequency, so 1/10th of the 200 digits are 9's. 20 While my method may seem a little harder at first, here's a followup question: how many 7's are there between 1 and 1 billion? (suddenly, you see the wisdom in DrPizza) Also, SandEagle, this is the easiest method to do without writing anything down. I think that most people who did it in their head wouldn't have counted two 9's for the number 99. Of course, there are 10 numbers that end in 9, and 10 two-digit numbers that begin with 9. So, that's 20. T

TruePaige

Diamond Member

Oct 22, 2006 9,874 2 0 Every number from 9 up contains 9 units, so I'll say you could also argue for 92. 100-91 = 9 99-90 = 9 etc..

IHateMyJob2004

Lifer

Sep 29, 2004 18,656 68 91

Originally posted by: Chaotic42 10 for each number which ends in 9 9 more for each number which begins with 9 I'm going with 19. Click to expand...

Minues the duplicate that is known as 99

her209

No Lifer

Oct 11, 2000 56,336 11 0 Technically, there are an infinite number of 9s between 0-100 because each number can be represented as a fraction.

IHateMyJob2004

Lifer

Sep 29, 2004 18,656 68 91 Holy crap, I read over the responses. WE are all idiots. Please lock thread. PLEASE! IS this really a good use of brain power? I jsut sent hte weekend reading the CMT annual reports.

SoulAssassin

Diamond Member

Feb 1, 2001 6,135 2 0

Originally posted by: txrandom 9, there is only one. Click to expand...

this It is the most accurate answer to the question worded as is.

videogames101

Diamond Member

Aug 24, 2005 6,783 27 91 Infinite. C

Chronoshock

Diamond Member

Jul 6, 2004 4,860 1 81 Depends on the base. In binary there is no such thing as 9 1 10 11 100

Nik

Lifer

Jun 5, 2006 16,101 3 56

Originally posted by: pontifex 0. I don't see any 9s between "1-100" Click to expand...

In the English language, there would be an infinite number of 9's between all numbers on the number line between 1 and 100. In the English language, there would be no 9's on the number line among 1 and 100. If the question is how many 9's are used to make any whole number between 1-100, the answer is 20. If the answer is how many times the number 9 appears between 1-100, the answer is once.

DrPizza

Administrator Elite Member Goat Whisperer

Mar 5, 2001 49,601 167 111 www.slatebrookfarm.com

Originally posted by: TruePaige Every number from 9 up contains 9 units, so I'll say you could also argue for 92. 100-91 = 9 99-90 = 9 etc.. Click to expand...

I think you'd lose the argument for 92. I think you mean a much larger number, because using your argument, the number 90 contains ten 9's. Off the top of my head, I believe that's 496 nines.

DrPizza

Administrator Elite Member Goat Whisperer

Mar 5, 2001 49,601 167 111 www.slatebrookfarm.com

Originally posted by: Nik

Originally posted by: pontifex 0. I don't see any 9s between "1-100" Click to expand...

In the English language, there would be an infinite number of 9's between all numbers on the number line between 1 and 100. In the English language, there would be no 9's on the number line among 1 and 100. If the question is how many 9's are used to make any whole number between 1-100, the answer is 19.As pointed out in the thread, 20. You fail. If the answer is how many times the number 9 appears between 1-100, the answer is once. Click to expand...

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