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en.wikipedia.org/wiki/Integer

An integer is a number that can be written without a fractional component. For example, 21, 4, ... Some authors use ℤ* for non-zero integers, others use it for non-negative integers, or for {–1, 1}. Additionally, ℤp is used to denote either the set of ...

mathworld.wolfram.com/NegativeInteger.html

A negative integer is one of the integers ..., -4 , -3 , -2 , -1 obtained by negating the positive integers. The negative integers are commonly denoted Z^- .

This lesson will be covering the world of negative integers. What is a negative integer? How do they work? Also, we will be looking at real...

www.mathsisfun.com/positive-negative-integers.html

Let us think about numbers as balloons (positive) and weights (negative): ... Now let's see what adding and subtracting negative numbers looks like: .... Number Line Using The Number Line Whole Numbers and Integers Multiplying Negatives  ...

Learn how to add and subtract negative numbers. The problems solved in this video are 2 - 3 = -1 and -2 - 3 = -5 and -2 + 3 = 1 and 2 - (-3) = 5 and -2 - (-3).

Practice plugging in values to evaluate negative number addition and subtraction expressions.