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The teacher was not embarrassed but shocked that any student could be so wrong. The division MUST be carried out before the subtraction. 230 – 220 × 0.5 = 230 – 110 = 120. Try it in any scientific calculator or programming language. You are alone (I hope) in thinking the answer is 5. Are you perhaps joking?
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As with a few readers, you missed the ! after the 5.
Brent
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this is excellent!
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That pesky little exclamation mark...
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Oh, come on! I immediately saw that: 5!=120
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Is it because you are saying 5! (factorial). 230 - 220 x 0.5 = 230 - 110 = 120 which is == 5x4x3x2x1 or 5!.
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Your answer is wrong, but not because of maths but because of your English usage. Your intention is to say the answer is 5 factorial in which case your first sentence would end with:
"and announced that the answer was 5!."
However, by leaving off the period, the exclamation mark ends the sentence, which means you are actually saying the answer is 5.
I realize leaving off the period was deliberate to make the trick work, but it's inaccurate, and we are all engineers here 
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Actually, your teacher realized you are more intelligent than him and he was embarrassed about that so he tried to cover for it by saying you were wrong.
I wouldn't try to stick it to him or prove your correctness I would just let it go. There is really no point in upsetting the guy who gives you your final grade.
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ooh, come to think of it your teacher might be referring to order of precedence for calculating algebra expressions. You might get the "correct" answer from him if you enforce your concept by expressing it something like (230 - 220) x 0.5, for this the answer is 5. Your teacher may have been implying that multiplication is calculated before subtraction, so he might be reading it as 230 - (220 x 0.5). It might be worth it to ask him if this is what he was thinking.
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surrender a Prohibition crime lord (7)
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Abandon ?
"I didn't mention the bats - he'd see them soon enough" - Hunter S Thompson - RIP
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Solution for those of us who are stumped most days.
Why do I read the CCC everyday but never have a clue about it?
I’ve given up trying to be calm. However, I am open to feeling slightly less agitated.
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surrender = a + Prohibition + crime lord
surrender = a + ban + don
I posted the solution because I actually got this one! - just 5 hours too late  .
If you can't laugh at yourself - ask me and I will do it for you.
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Sorry Mark ( and others ) because the same group of people on here tend to solve most clues these days I often don't post the breakdown as they obviously know it , I didn't realise other people follow it 
"I didn't mention the bats - he'd see them soon enough" - Hunter S Thompson - RIP
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Looks good. Thanks for the tip! 
Anything that is unrelated to elephants is irrelephant
Anonymous
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The problem with quotes on the internet is that you can never tell if they're genuine
Winston Churchill, 1944
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Never argue with a fool. Onlookers may not be able to tell the difference.
Mark Twain
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they got a machine for me (was working on a VM before that).
The PC has... drum roll.... 128Gb of RAM!
I dig that! 
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That makes me feel small. 
Real programmers use butterflies
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Little witch will become big!  one day far, far, far away..
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compensating for something? 
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Wow, that's awesome! 
"In testa che avete, Signor di Ceprano?"
-- Rigoletto
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