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A hole is usually taken to be the absence of 1 so a hole and a half is a negative half or -1/2.
A negative number is any real number that is less than zero. Such numbers are often used to represent the amount of a loss or absence. For example, a debt that is owed may be thought of as a negative asset, or a decrease in some quantity may be thought of as a negative increase. Negative numbers are also used to describe values on a scale that goes below zero, such as the Celsius and Fahrenheit scales for temperature.
I will not tolerate another absence from my class!
In the absence of credible evidence, the judge dropped the case. Due to the absence of the teacher, a substitute was called.
I felt an absence in my heart when my dog died.