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Old 07-26-2009, 08:56 PM   #1
SandEagle
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Default How many 9's between 1-100?

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

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Old 07-26-2009, 08:58 PM   #2
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Default How many 9's between 1-100?

10 for each number which ends in 9
9 more for each number which begins with 9

I'm going with 19.
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Old 07-26-2009, 08:58 PM   #3
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Default How many 9's between 1-100?

same question as how many 7's are between 1-100
20
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Old 07-26-2009, 08:59 PM   #4
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Default How many 9's between 1-100?

Quote:
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.
wrong
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Old 07-26-2009, 09:00 PM   #5
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Default How many 9's between 1-100?

Quote:
Originally posted by: SandEagle
wrong
Ah, never mind. I'm an idiot.
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Old 07-26-2009, 09:02 PM   #6
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Default How many 9's between 1-100?

Quote:
Originally posted by: Chaotic42
Quote:
Originally posted by: SandEagle
wrong
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?
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.
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Old 07-26-2009, 09:02 PM   #7
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Default How many 9's between 1-100?

Every last one of them.
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Old 07-26-2009, 09:02 PM   #8
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Default How many 9's between 1-100?

Quote:
Originally posted by: SandEagle
Quote:
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.
wrong
got me too

20.. right?
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Old 07-26-2009, 09:02 PM   #9
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Default How many 9's between 1-100?

0.

I don't see any 9s between "1-100"
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Old 07-26-2009, 09:03 PM   #10
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Default How many 9's between 1-100?

Quote:
Originally posted by: pontifex
0.

I don't see any 9s between "1-100"
:laugh:
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Old 07-26-2009, 09:03 PM   #11
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Default How many 9's between 1-100?

there are two 9's in 99, chaotic42.
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Old 07-26-2009, 09:03 PM   #12
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Default How many 9's between 1-100?

Quote:
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.
Yup. It's 20 as long as he's talking integers.
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Old 07-26-2009, 09:04 PM   #13
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Default How many 9's between 1-100?

Quote:
Originally posted by: pontifex
0.

I don't see any 9s between "1-100"
this work too if you're a smartass
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Old 07-26-2009, 09:04 PM   #14
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Default How many 9's between 1-100?

9, there is only one.
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Old 07-26-2009, 09:08 PM   #15
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Default How many 9's between 1-100?

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.
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Old 07-26-2009, 09:11 PM   #16
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Default How many 9's between 1-100?

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..
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Old 07-26-2009, 09:15 PM   #17
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Default How many 9's between 1-100?

Quote:
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.
Minues the duplicate that is known as 99
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Old 07-26-2009, 09:16 PM   #18
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Default How many 9's between 1-100?

Technically, there are an infinite number of 9s between 0-100 because each number can be represented as a fraction.
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Old 07-26-2009, 09:17 PM   #19
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Default How many 9's between 1-100?

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.
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Old 07-26-2009, 09:21 PM   #20
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Default How many 9's between 1-100?

Quote:
Originally posted by: txrandom
9, there is only one.
this

It is the most accurate answer to the question worded as is.
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Old 07-26-2009, 09:22 PM   #21
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Default How many 9's between 1-100?

Infinite.
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Old 07-26-2009, 09:24 PM   #22
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Default How many 9's between 1-100?

Depends on the base. In binary there is no such thing as 9

1
10
11
100
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Old 07-26-2009, 09:29 PM   #23
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Default How many 9's between 1-100?

Quote:
Originally posted by: pontifex
0.

I don't see any 9s between "1-100"
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.
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Old 07-26-2009, 09:31 PM   #24
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Default How many 9's between 1-100?

Quote:
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..
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.

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Old 07-26-2009, 09:31 PM   #25
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Default How many 9's between 1-100?

Quote:
Originally posted by: Nik
Quote:
Originally posted by: pontifex
0.

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