Rational Number: A number that can be expressed as a ratio in fraction form.
examples: 1, -2, 1/4, -0.25
Multiplication: The operation of repeated addition of the same number.
example: 4 x 3 has the same value as 3+3+3+3
Operation: addition, subtraction, multiplication, division, and raising a number to a power are some mathematical operations.
Expression: A variable or combination of variables, numbers, and opertion symbols that represents a mathematical relationship.
> (is greater than)
> (is greater than) The number or expression to the left of the symbol has greater value than the number or expression tot he right of the symbol.
= (is equal to)
= (is equal to): The number or expression to the left of the symbol has the same value as the number or expression tot he right of the symbol.
Area: the measure, in square units, of the interior region of a 2-dimensional figure or the surface of a 3-dimensional figure.
Opposites: Numbers that are the same distance from zero in different directions on a number line.
example: 2 and -2 are opposites
order of operations
Order of Operations: Rules describing what sequence to use in evaluating expressions. Parentheses, exponents, multiply or divide left to right, add or subtract left to right.
< (is less than)
< (is less than): The number or expression to the left of the symbol has less value than the number or expressison to the right of the symbol.
Divide: separate into equal groups and find the number in each group or the number of groups.
Solution: any value for a variable that makes an equation true
example: the solution of 2x=24 is x=12
Division: the operation of making equal groups and findign the number in each group or the number of groups.
Mental Math: a way to calculate an exact answer without using paper and pencil or other physical aids.