You draw a straight line; mark a point and call it "zero"; decide on which direction should be positive; mark points at regular intervals - for example, every centimeter; and label those points. To one side of zero you mark the points as 1, 2, 3, etc.; to the other side, as -1, -2, -3, etc.
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It's the number's distance from zero on a number line. Basically just make the number positive and there you go.
They are the numbers that are placed on a number line that are exact same distance away from 0
Put a slash line followed by a 1 after the number. For example: Make the number 9 into a fraction. Answer: 9/1
You make a line of numbers in this case factors.