-3.8 is a mixed number in decimal form and there is no sensible way to represent it as a whole number. The whole part of it is -3.
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Yes, 38 is a whole number.
the decimal would be .38. if there was a whole number in front of it like 6 then the answer would be 6.38, but if there is no whole number it would be 0.38 or .38 which ever you would use but they both mean the same thing.
52% of 38 = 0.52 * 38 = 19.76 which when estimated to the nearest whole number = 20.
When rounding a decimal number to the nearest whole number, you look at the digit to the right of the decimal point. In this case, 38 is already a whole number. So, when rounded to the nearest whole number, 38 remains 38.
They are +/- 6