Can you name the three-digit number that isn't divisible by the given number?

Divisible By...	Odd One Out	Possible Numbers
2		116, 134, 233, 494, 888
3		102, 311, 462, 591, 708
4		240, 544, 716, 876, 954
5		235, 285, 371, 480, 890
6		318, 498, 678, 838, 942
7		191, 231, 511, 665, 875
8		112, 458, 656, 744, 992
9		279, 297, 651, 693, 711
10		200, 510, 560, 650, 655
11		155, 198, 550, 781, 891

Divisible By...	Odd One Out	Possible Numbers
12		156, 300, 408, 660, 880
13		273, 338, 416, 542, 585
14		322, 466, 532, 686, 742
15		405, 555, 615, 775, 960
16		176, 624, 672, 720, 958
17		204, 306, 469, 561, 833
18		162, 288, 754, 828, 864
19		399, 489, 608, 779, 836
20		350, 400, 520, 740, 860
2	350, 400, 520, 740, 860
3	350, 400, 520, 740, 860
4	350, 400, 520, 740, 860
5	350, 400, 520, 740, 860
6	350, 400, 520, 740, 860
7	350, 400, 520, 740, 860
8	350, 400, 520, 740, 860
9	350, 400, 520, 740, 860
10	350, 400, 520, 740, 860
11	350, 400, 520, 740, 860
12	350, 400, 520, 740, 860
13	350, 400, 520, 740, 860
14	350, 400, 520, 740, 860
15	350, 400, 520, 740, 860
16	350, 400, 520, 740, 860
17	350, 400, 520, 740, 860
18	350, 400, 520, 740, 860
19	350, 400, 520, 740, 860
20	350, 400, 520, 740, 860

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Odd Number Out Quiz

by puckett86

Created May 4, 2011 in Science
Featured May 23, 2011
Game Plays 31,645

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	puckett86:	May 23rd, 2011 at 04:44 GMT	10 points
	@triviafanpatriot I've lowered the time from 7 to 6 minutes, but I don't think there's anything I can really do to prevent people from cheating. On a related note, for those of you who are wondering how to do this without cheating, check out rockgolf's post (and others) in the archived comments for some divisibility rules.

	godpaul25:	May 23rd, 2011 at 04:56 GMT	23 points
	even if you dont have the rules for divisibility memorized (which i don't past 10) you can simply figure out if the first number is divisible, and if so, just subtract that # from the next # and see if the difference is divisible. Making it a smaller number is easier and faster. I.e. for #13: 273 is divisible by 13 (21 times) so subtract 273 from the next number, 338 = 65. Is 65 divisible by 13? yes 5 times. So subtract 338 from 416 = 78 (yes, 6x) etc until you find one that isn't. Just simplifies it esp if you can subtract in your head faster than you divide.

	diplomatt:	May 23rd, 2011 at 06:47 GMT	4 points
	I started rushing and missed the 8 question. What a goof. Slow and steady wins the race, my friends.

	woowoo682:	May 23rd, 2011 at 07:06 GMT	8 points
	those damn 17's were always the worst part of the multiplication tables for me

	x_Deggerz_x:	May 23rd, 2011 at 08:06 GMT	5 points
	Must admit. This has been the most frustrating quiz...and thats what I like from a quiz :) GOOD JOB

	druhutch:	May 23rd, 2011 at 09:27 GMT	7 points
	I love how you've embraced the new 'wrong answer' format. However, I was told there would be no math. (Then again I'm pretty okay with getting only half of them right. In my high school that would've qualified me for the "mathletes")

	TL333s:	May 23rd, 2011 at 12:30 GMT	2 points
	Wrong answers in Sporcle? What?

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	Pogues:	May 23rd, 2011 at 14:36 GMT	2 points
	The time seems to be perfect. I managed to, with some made up math rules...apparently, get through every question in the time allotted. Now if I just managed to get them all correct....hmph. Fun quiz.

	PAisGreat:	May 23rd, 2011 at 14:52 GMT	2 points
	I love math quizzes! Usually I just can't type fast enough, but this one gave me enough time to type & it was mentally refreshing.

	burnsy:	May 23rd, 2011 at 15:21 GMT	5 points
	"Nine, nine, nine. That crazy number nine. Times any number you can find, it all comes back to nine." God, I loved Square One. God, I was a nerd.

	heynostradamus:	May 23rd, 2011 at 16:53 GMT	7 points
	Good quiz. I wouldn't change the time to make sure people don't use a calculator. If people want to be dbags and cheat, fair enough. It doesn't really affect me. What satisfaction could you possibly get out of using a calculator? It's just like any other quiz on here. You could use google. But what's the point then?

	MoRichBowler300:	May 23rd, 2011 at 17:56 GMT	5 points
	godpaul25, there is a divisibility rule for 11. Alternatively subtract and add the numbers that you are trying to see is a multiple of 11. If the answer adds up to 0 or a multiple of 11, then it works. For example lets take the number 889724. 8 - 8 + 9 - 7 + 2 - 4 = 0, so 889,724 is divisible by 11.

	godpaul26:	May 23rd, 2011 at 19:14 GMT	0 points
	Yes I know there is. I just don't have it memorized is what I said

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	sluh138:	May 24th, 2011 at 02:01 GMT	2 points
	Great quiz...

	squiggsy:	May 24th, 2011 at 16:53 GMT	-4 points
	All numbers can be divided by all numbers except no number can be divided by zero. I'd change the description and/or title to include the word evenly. 233/2 = 116.5. It can be done, just not evenly. Good quiz and format.

	puckett86:	May 24th, 2011 at 19:37 GMT	4 points
	@squiggsy: x is divisible by y if x/y is an integer. So the "evenly" part is understood when you say "divisible".

	PlumpMenofHaddam:	May 25th, 2011 at 00:41 GMT	3 points
	Great topic, and good selection of numbers. I do think the rules should be a bit more clearly stated -- it's not clear that one would only get one shot at each question. (I'm fine with the format, but the intro should be a bit more clear on that point.)

	PK9:	May 25th, 2011 at 02:07 GMT	3 points
	Most of the answers for the multiples of three (6, 12, 15, 18) fail the test for being multiples of three, greatly simplifying each test. 651 (for 9) is the only one that is a multiple of three, but not a multiple of its clue.

	Shwoo:	May 26th, 2011 at 13:19 GMT	3 points
	Stupid primes. I wonder if there is a divisibility rule for 17 or 13. I only know the ones for 1-11, excepting 7.

	squiggsy:	May 30th, 2011 at 16:37 GMT	-1 points
	@puckett86 That may be true, but nowhere in this quiz does it say integer. It only says number.

	puckett86:	Jun 2nd, 2011 at 20:07 GMT	5 points
	@squiggsy It doesn't have to say integer. x/y needs to be an integer, but x/y isn't given. I just give you x and y, and yes they happen to be integers, but they don't have to be. Example: 2e is divisible by e; because 2e/e is 2, an integer, but neither 2e nor e are integers. It is all stated correctly.

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	puckett86:	Jun 10th, 2011 at 03:02 GMT	5 points
	@squiggsy 233 is not divisible by 2 because there is a remainder (of 1) when you calculate 233/2. The term "evenly divisible" is archaic, and is now simply "divisible".