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What are Integers? What is an integer? An integer is a positive or negative whole number. Remember, whole numbers cannot have decimal values other than 0! (2.00 is an integer because it can be written as 2, 2.35 is not an integer, it is a rational number) Examples of Integers: +3, - 4, +2, -10 Non-Examples: ∏ , - 3.5, 4.25 Practice: Identify which of the following numbers are integers and which are not. a) +2.2 b) – 3 c) – 1 d) 0 e) -2.0 f) +10 g) – 3.36 h) +0.838383 i) +1/3 h) -3/4 or 0.75 The Zero Principle The zero principle states that the sum of opposite integers is zero. Example: (+3) + (-3) = 0 Are negative Are positive =0 Practice: Show the zero principle using 3 different amounts of counters What words do we use to describe positive and negative integers? Positive Integers Negative Integers