algebra
The part of mathematics in which letters and other general symbols are used to represent numbers and quantities in formulas and equations.
variable
A symbol for a number we don't know yet. It is usually a letter like x or y.
algebraic expression
A variable or combination of variables, numbers, and symbols that represents a mathematical relationship.
evaluate
To find the value of a mathematical expression
numerical expression
Combines numbers,using operators
coefficient
A numerical factor in a term of an algebraic expression.
constant
is a number on its own, or sometimes a letter such as a, b or c to stand for a fixed number. Example: in "x + 5 = 9", 5 and 9 are constants
absolute value
The distance of a number from zero on the numberline. Always positive.
decimal
A number with one or more digits to the right of a decimal point.
fraction
A way to describe a part of a whole or a part of a group byusing equal parts.