Constructing a formula

Use letters to stand for the quantities in the formula.

Find the link between the quantities, and use algebra to describe the link.

Substituting numbers into formulae

First rewrite the formula, replacing every letter with its value.

Then do the calculation, using BIDMAS as necessary.

Example videos

Video: https://www.youtube.com/embed/48Yjq1HK_9Q

Video: https://www.youtube.com/embed/QbaHSmBmlRw

Practice questions

Formulae and sequences - questionsFormulae and sequences - worked solutions