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How do you round up and down in maths?

What are the rules?

Rounding up and down in general math courses the way I was taught was below 5 go down and 5 and up go up to the next.You have 45 and you round up to 50 or what you need for an answer and you round down to from 45 is could be down to 40.  I was trying to this from memory.  Hope this helps.
24 October 2016
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