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You are using an out of date browser. It may not display this or other websites correctly.You should upgrade or use an alternative browser. How many 9's between 1-100?

• Thread starter Thread starter SandEagle
• Start date Start date Jul 26, 2009

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SandEagle

Lifer

gah, i had to redo this many times... try figuring it out without writing anything down.

Chaotic42

Lifer

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

same question as how many 7's are between 1-100 20

SandEagle

Lifer

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

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

Ah, never mind. I'm an idiot.

Poulsonator

Golden Member

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

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

0. I don't see any 9s between "1-100"

GeekDrew

Diamond Member

there are two 9's in 99, chaotic42.

IronWing

No Lifer

Every last one of them.

Chaotic42

Lifer

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

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

:laugh:

SandEagle

Lifer

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

9, there is only one.

DrPizza

Administrator Elite Member Goat Whisperer

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

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

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

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

IHateMyJob2004

Lifer

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

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

Infinite. C

Chronoshock

Diamond Member

Depends on the base. In binary there is no such thing as 9 1 10 11 100

Nik

Lifer

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

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

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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