Half of 81 without a decimal point would be 40.5. Dividing 81 by 2 gives you 40.5 as the result. Since you specified no decimal point, the answer would be 40.5.
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Since 81 isn't an even number it has to either be in fraction or decimal form such as 40.5 or 40 1/2
It is 500, and there is no need for decimal point.
81
If you mean: 81/100 then as a decimal it is 0.81
81,000 is 81 thousands.0.081 is 81 thousandths.
You know the digits will be 81, but where does the decimal point go? Since 0.9 has 1 place and 0.09 has 2 places, the answer will have 1+2=3 decimal places. Since 81 is only 2 digits, insert a leading zero after the d.p. The answer is 0.081