An expression like 3 + *n* is a statement with numbers and/or variables, and at least one operation.

A variable can represent the unknown value. You can find the value of an expression if you know the value of the variable. For example: 3 + *n*.

An equation is a sentence like 4 + 5 = 9 that contains an equals sign. The equal sign shows that the expressions on each side of it are equal. Equations sometimes have missing numbers.

4 + *x* = 9 10 - *m* = 6 *k* - 1 = 7

Powerpoint-Growing Patterns and Function Tables: http://www.authorstream.com/Presentation/ttravis-588089-growing-patterns-and-function-tables/

When you find the value of the missing number that makes the equation true, you solve the equation.

A pattern is a sequence of numbers, figures, or symbols that follow a rule. You can find and extend a pattern.

In a repeating pattern the core of the pattern repeats. For example, if the core of a pattern is 1234, the pattern will repeat 1234 again. 123412341234.

In a growing pattern one or more levels of the pattern grow. For example:

A function table shows you the relationship between a pair of numbers. The relationship is defined by a rule, and this rule applies to all the pairs of numbers in the table.

You can think of the rule as a box or machine: