The positivity of a number may be emphasized by placing a plus sign before it, e.g. Conversely, a number that is greater than zero is called positive zero is usually ( but not always) thought of as neither positive nor negative. To help tell the difference between a subtraction operation and a negative number, occasionally the negative sign is placed slightly higher than the minus sign (as a superscript). For example, −3 represents a negative quantity with a magnitude of three, and is pronounced "minus three" or "negative three". Negative numbers are usually written with a minus sign in front. For example, −(−3) = 3 because the opposite of an opposite is the original value. The laws of arithmetic for negative numbers ensure that the common-sense idea of an opposite is reflected in arithmetic. Negative numbers are used to describe values on a scale that goes below zero, such as the Celsius and Fahrenheit scales for temperature. If a quantity, such as the charge on an electron, may have either of two opposite senses, then one may choose to distinguish between those senses-perhaps arbitrarily-as positive and negative. A debt that is owed may be thought of as a negative asset. Negative numbers are often used to represent the magnitude of a loss or deficiency. In the real number system, a negative number is a number that is less than zero. In mathematics, a negative number represents an opposite. This thermometer is indicating a negative Fahrenheit temperature (−4 ☏). Real number that is strictly less than zero
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