Mathematics — first biennium · Lesson
In an algebraic expression a letter represents a quantity that may vary; numbers without letters are constant quantities.
In this lesson: Interpret letters as quantities and distinguish variables, constants and algebraic expressions.
How to proceed: Ask what may change: the letter represents the variable quantity. A number written on its own is a constant term.
You can already assume: Properties of operations.
Completed exercises: 0/5 · Correct on first attempt: 0
Ask what may change: the letter represents the variable quantity. A number written on its own is a constant term.
ConceptStep separates what is required from what is recommended or useful as reinforcement. Only required prerequisites block your progress.
Relationships: solid line = required · dashed line = recommended · dotted line = reinforcement.