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Across 4. Two numbers with the same absolute value but different signs. 6. Any number that is less than zero. 7. The sum of data divided by the number of items in the data set 8. One of four regions into which the x- and y-axes separate the coordinate plane.

Down 1. A number that when added to a given number, results in a sum of zero. Example: The additive inverse of 4 is -4 because 4 + (-4) = 0. 2. The number that corresponds to a point on a number line. 3. The absolute value of a number a is its distance from zero on a number line and is represented by |a|. Example: The absolute value of -2 is 2, or |-2| = 2. 5. The set of whole numbers and their opposites {. . .-2, -1, 0, 1, 2. . .}.