@howie_hua: How would you pronounce 1/21? @etymologynerd Can you please explain why the correct way sounds weird? #math #mathematics #maths #mathtok #stem

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Thursday 24 July 2025 15:51:49 GMT
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rangsk_yt
Rangsk :
I bet you're fine with "one third" though. I think this stems from usually only talking about smaller denominators in common speech. Up to 1/20, "first" and "second" never show up. Thus, it feels weird to use "one twenty first". "One half" and "one third" can be internalized as special cases as typically happens with a very small numbers. From there the ordinals feel like saying the number with the TH suffix. 4th 5th 6th 7th 8th 9th. Then we hit the teens and they all have special names that all end in TH. Eleventh, twelfth, and then all the teenths. 21 is the first time you encounter the fact that we're actually just using the ordinals, so saying 21st is odd because it's the first "non-special case" that doesn't end in TH.
2025-07-24 21:17:50
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manolis_lardas
Μανώλης Λάρδας :
I would assume it has something to do with twenty first sounding like an ordinal, basically, but that can't be the whole picture, because one twenty third sounds way more reasonable, I think.
2025-07-25 12:48:10
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skyxs22
Skyxs :
would you also say one/twenty-twoth? and twenty-threeth?
2025-07-27 19:07:09
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bsnakxtp5m0
George :
Similarly, I have pronounced 1/e as “one eeth” as a joke
2025-07-24 16:11:51
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keshaviscracked
Keshaviscracked :
one twenty onth
2025-07-24 15:55:09
11
eddiepriceiii
Eddie Price :
My initial reaction was "one twenty-first". But the fact that you were asking could have influenced my gut reaction. And I agree that "twenty-first" sounds a bit weird. That being said, I would on l understand someone saying "one twenty-first" or "one twenty-oneth" so I don't think it's a serious issue as long as we understand each other! It reminds me of a time when a professor in grad school was talking about nth roots of 2 and ended up saying "2th root of 2" at one point. As funny as it might sound, no one was confused by what was meant.
2025-07-24 16:22:41
11
parnmatt
Matt Parnell :
"a twentyoneth" because for me the ordinal in my perspective is (1/21), not 21. The ordinal suffix therefore attaches to that fraction, a fraction isn't a 1 so it's not a first. …but saying that, context is important. there are times I would say oneth, rather than first, when I'm talking about 0-based indices. As the "first" element is at index 0, it's the zeroth element… the "second" element is at index 1, the oneth element.
2025-07-24 17:10:37
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mradroq
AyeKwick :
We have separate words for “half” and “quarter” so why not something like “a twunth”? 😃
2025-07-26 10:52:13
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michael.merryweather
Michael Merryweather :
One divided by twenty one
2025-07-26 20:28:48
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andrwandrwwvvwvvw
andrwandrwwvvwvvw :
1 over 9 plus 10
2025-07-25 04:50:59
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ahoustonmath
Aaron Houston :
If I have to share my cake with 20 other people, I’m just getting a second cake and eating 1 tenth or 1 eleventh.
2025-07-24 17:25:51
1
cliocorvid
Clio :
Follow-up: For 1/22, do you want to say "twenty-second" or "twenty-twoth"?
2025-07-24 21:44:13
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benroyal2
benroyal :
My solution is to only cut cakes, pizzas, etc. into even numbers of pieces, thereby avoiding this problem altogether. I guess that’s more of an evasion than a solution…
2025-07-24 23:53:47
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fj17283
fj17283 :
I said, 1/21st because if you are in a race and in the “21” place you are 21st
2025-07-24 17:03:03
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yungrender
yungrender :
Interestingly enough I’d say “a/one twenty-first” but “two+ twenty-oneths” 🤔
2025-07-25 01:36:40
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shaaz.89
Shaaz :
Why wouldn’t you just say “one over twenty-one” though?
2025-07-24 18:43:55
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samcrawley493
samcrawley493 :
Id say “a” 21st
2025-07-24 17:21:24
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vito.1225
- :
…focusing on this is why English lit majors’ understanding of math ends at fractions.
2025-07-25 16:46:02
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marax_69
MarK :
same about 1/22, one twenty-second or one twenty-twoth...
2025-07-24 16:34:42
1
nivag___
nivaG___ :
The last day of July would be the thirty first not the thirty oneth
2025-07-24 16:02:23
1
silentpartner07
SilentPartner :
What can’t I say one over twenty one? I actually can say it.
2025-07-25 20:32:00
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clustercuss49
Gareth McDonald998 :
What about 1/22 ? One twenty second sounds right there, but One twenty twoth doesn’t
2025-07-26 06:21:21
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emyk082021
emyk082021 :
I pronounce 1/11 as one-eleven-irst
2025-07-24 19:46:36
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cliff.750.3
cliff.750.3 :
math minds think alike
2025-07-25 12:43:31
0
ericshun35
MikeHunt :
It sounds weird because you are used to using the top number phonology as a basis for the bottom. But you would have no problem saying twenty-firsr century or july twenty-first
2025-07-24 19:18:47
0
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