The usual practice with a 5 is to round up, so for example 7.5 is about 8.
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18.27 ( 5 and up round up 4 and down round down :P )
Always look at the next digit to the right of where you want to round up or down to. If the next digit is 5 or more, you round up. If it's 4 or less, you round down. In this case, you would round the number down to 15.33
If the hundreds are 5 and above, round up. Four and below, round down. 18,000
Anything 5 or about round it up. 4 or below round down. Example: 4.2 round down to 4.0 6.7 round up to 7.0 4.76 round up to 4.8
you round fractions by rounding up or down, you can decide to do this when you look at the numerator and decide if it is half of the denominator, if it is half or more than half, you round up. If it is less than half you round down. Another way you can round fractions is dividing the top number by the bottom number (with a calculator), then if the decimal part is 5 or more, round up! (if the decimal is less than 5, round down.)