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Negative Numbers
You can consider any direction as positive, and the opposite direction as negative. However, in this case it is customary to call a gain "positive", and a loss "negative".
They are called positive integers or whole numbers
When subtracting negative integers, one can relate it to the overall attitude of a room. If a room contains a number of people of positive and negative attitude you can get rid of people (or subtract people) with negative attitudes to make the overall attitude of the room more positive. If you subtract a negative integer it makes it positive.
Some people work as a teacher or a mathmetition, they use negative numbers in their everyday lives. Some people use negative numbers when they are overdue.