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3.1You look at the second digit after the decimal point and ask if it is greater than or equal to 5.If it is you round up the first digit after the decimal point. If not, then you round down (i.e. the first digit after the decimal point stays as it was).So for 3.077, "7" is greater than or equal to five so we round up to 3.1 (to one decimal place).
224.60 is greater than 224.56 if your considering two decimal points. But if you was to round it too one decimal point they would be equal. As 224.56 would round to 224.6 = 224.6
to round to one decimal point all you have to do is move the decimal point once to the right for example: 0.808 becomes 08.08
yes.
If the decimal point on a number is less than 0.5 then round the number down, for example 12.49999 rounds to 12 with zero decimal places. If the decimal point on a number is equal to or greater than 0.5 then round the number up, for example 12.500000 rounds to 13 with zero decimal places.