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How to Determine Integers

An integer is a number without a fraction or decimal. An integer can be positive, negative or zero, and can be shown on a number line, such as -2, -1, 0, 1 and 2. A positive integer has either a "+" sign or no sign in front of it. A negative integer has a "-" sign in front of it. Zero has neither a positive nor negative sign. You can determine whether a number is an integer by examining what the number consists of, such as a fraction, decimal or whole number.

Instructions

    • 1

      Find three numbers that you want to determine are integers. For example, determine whether the numbers 1.2, -5 and 0 are integers.

    • 2

      Determine whether the first number contains a fraction or decimal, or whether it is 0. For example, the number 1.2 contains a decimal portion, 0.2. Therefore, the number is not an integer.

    • 3

      Determine whether the second number contains a fraction or decimal, or whether it is 0. For example, the number -5 contains no fraction or decimal. Therefore, by definition, the number -5 is an integer.

    • 4

      Determine whether the third number contains a fraction or decimal, or whether it is 0. For example, the third number is 0. By definition, this makes it an integer.

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