There are many situations in which you need to use numbers below zero, one of these is temperature, others are money that you can deposit (positive) or withdraw (negative) in a bank, steps that you can take forwards (positive) or backwards (negative).

Positive integers are all the numbers greater than zero: 1, 2, 3, 4, 5, … . Negative integers are all the opposites of these numbers: -1, -2, -3, -4, -5, …. . The integers are the set of positive numbers, negative numbers and zero. We use the letter Z to refer to this set.

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