additive inverse | Any two numbers whose sum is zero, such as 3 and -3, because 3 + (-3) = 0. |
inverse operations | A mathematical operation that can reverse or “undo” another operation. Addition and subtraction are inverse operations. Multiplication and division are inverse operations. |
opposite | An opposite of a number is the number with the opposite sign, but same absolute value. For example, the opposite of 72 is -72. A number plus its opposite is always 0. |
real numbers | All rational or irrational numbers. |