Change - A variation in size, amount or behaviour.
Equivalence - The state of being identically equal or interchangeable, applied to statements, quantities, or expressions.
Generalization - A general statement made on the basis of specific examples.
Justification - Valid reasons or evidence used to support a statement.
Measurement - A method of determining quantity, capacity or dimension using a defined unit.
Model - A depiction of a real-life event using expressions, equations or graphs.
Pattern - A set of numbers or objects that follow a specific order or rule.
Quantity - An amount or number.
Representation - The manner in which something is presented.
Simplification - The process of reducing to a less complicated form.
Space - The frame of geometrical dimensions describing an entity
System - A group of interrelated elements