Function: A relationship that instructs how to get from an input to an output  

Input: the number/ symbol put into a function

Output: the number/ expression that comes out of a function

Operation: a mathematical process (e.g. brackets, power, addition + , subtraction − , multiplication × & division ÷)

Inverse operation: that undoes what was done by the previous operation (the opposite operation)

Commutative: the order of the operations do not matter.

Expression: Numbers, symbols and operators (such as + or - grouped together that show the value of something.) (None of these signs: = ≠ < > ≤ )

Linear: the difference between terms increases or decreases by the same value each time

Sequence: A list of numbers or objects in a special order.

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Command words:   

Evaluate: to work out the value

Substitute: replace one variable with a number or new variable.