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I've looked it up and know that "that's that" has several meanings in different contexts. such as "a piece of cake" or "it's done(reach a conclusion)". I can't decide which meaning it is in this context, I think both are OK.

//Transcript:

We decided the fairest way to settle this argument(whether 1 is a prime number)was to do a survey of 100 million Murderous Maths readers. Here are the results:

is 1 a prime Number? Votes

yes 7

no 8

don't know 211

don't care 99999774

The Murderous Maths Organization can now proudly declare that the number 1 is NOT prime by 8 votes to 7.

So that's that. //

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    It's right at the bottom of the page of text, after a declaration. Why do you not think it means ""it's done"? – Michael Harvey Aug 30 '20 at 15:49
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    I appreciate that you transcribed the text in your question, in addition to the uploaded picture. That is a really good practice. Thank you for doing that and making it easier for us to answer your question. Pictures are not always needed but typed out context is. On the other hand, this phrase is a very common phrase and easily Googlable. I understand you may not have access to Google (given that you have a Chinese last name and Google is blocked in certain countries), so I wrote up a quick answer. Next time please remember to include in your question the definitions you find. – Eddie Kal Aug 30 '20 at 15:53
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    By the way, I hope you realise how this whole page is a joke... It wants to teach children to remember that "1 is not a prime", but the story about "doing a survey of 100 million readers" and "999 999 774 voting for 'don't care'" is just to engage the young readers, get a giggle and keep them reading a topic that is otherwise very boring for a 10-year-old. – James K Aug 30 '20 at 16:00
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    @James K: It also puts me in mind of when I was a child and there was an ad campaign for some specific brand of cat food that always ended with the byline 9 out of 10 cat owners who expressed a preference say their cat likes our product best. Me and my siblings invariably used to chorus 99 out of 100 / 999 out of 1000... (or increasingly large numbers, spoken quickly enough to still reach our punchline at the same time) ... would rather eat mouse! – FumbleFingers Aug 30 '20 at 16:08
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That's that is a very idiomatic expression.

Cambridge Dictionary gives:

an expression that shows that something has ended:
I won't agree to it and that's that (= I won't discuss it any longer).

Putting this definition into context, it just means "That concludes the matter."

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    I'd add that in this context it's intended for humorous effect. If 99,999,774 of ten million respondents didn't care then normally a discussion would be anything but concluded. The entire page reads as if it's tongue in cheek. – jla Aug 31 '20 at 1:49
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    @jla That, and the claim that 100 million Murderous Math readers were polled (both the idea that that many were polled, and that that many exist in the first place, are ridiculous). – Acccumulation Aug 31 '20 at 4:56

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