It is 2.12 since it is more than 100 it becomes a whole.
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12 = 10 + 2
7/12 as a decimal is approximately 0.5833.
12
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 -12, exactly as in the question.
12/18 First reduce the fraction to its lowest terms 12/18 = 2/3 2/3 as a decimal is 0.666.... ( recurring to infinity).