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for example if i have a number with the last digit greater than 5 like 12.76 i know that i can round up to 12.8 and if the last digit is less than 5 for example 12.74 i know that i can round up like this 12.7, but i didn't understand how to round up if i have a number like this : 12.65.

my book says:

" If the last digit dropped is equal to 5, the remaining digit should be rounded to the nearest even number. (This helps avoid accumulation of errors in long arithmetic

processes.)"

Can you explain me what is the meaning (english is not my mothertongue)? I can't understand it, and can you make me some examples ? please