8.4 ÷ 2 = 4.2
Note: 8.4 is already a decimal.
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decimal for 11 and a half = 11.5
A half which is 1/2 is 0.5 as a decimal
A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. A decimal representation does not require a decimal point. So the required decimal representation is 84, exactly as in the question.
0.845 is greater.
We write two and a half as 2.5 in decimal form.