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 -1, exactly as in the question.
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decimal form of -1 = -1.0
decimal form of a half (1/2) = 0.5 1/2: = 1 ÷ 2 = 0.5 in decimal
1 half in decimal form = 0.5
That already is decimal form. As a fraction, it is 1/3
5 and 1/5 is 5.2 in decimal form.