equation: A mathematical statement with an equal sign showing that two values are equal.

equivalent fractions: Fractions equal to one another, even though they may have different denominators.

even number: A number that can be divided by 2.

exponent; power: A value in smaller type found above and to the right of the base that indicates the number of times the base is multiplied by itself.

expression: Any combination of values (variables, numbers, and/or constants) and operations that can be used to show how things belong together and compare to one another.