Use a formula
- Identify the subject of the formula.
- Substitute each value carefully.
- Calculate using order of operations.
Answer: P = 2l + 2w with l = 6 and w = 4 gives P = 20
𝑥 Algebra
Formulae
Learn formulae with a GCSE-style explanation, help guide, worked example, practice question and flashcards.
Global XP
Level 10 / 100 XP
1. Explanation
Key idea
- Formulae is part of algebra and appears often in KS3–GCSE maths.
- Formulae connect variables so you can calculate unknown quantities.
- Use the worked model, help guide, interactive question and flashcards to practise formulae until the steps feel automatic.
Real-life examples
- Shopping, sport, travel, science, design and everyday decisions all use this skill.
2. Visual
Formulae learning map
Understand the key idea → follow the help guide → practise a question → check your method → build speed with flashcards.
3. Help guide
How to tackle Formulae
- Learn the rule: Formulae connect variables so you can calculate unknown quantities.
- Worked model: Identify the subject of the formula. Substitute each value carefully. Calculate using order of operations.
- Try the interactive question without looking at the answer first.
- Use the flashcards to test the rule, the method and a common check.
4. Worked examples
Step-by-step working
5. Interactive questions
Try it yourself
Use A = lw to find A when l = 8 and w = 5.
6. Flashcards
Master quick recall
Flip each card, then choose whether you know it or need more practice.
0 mastered
FrontRule for Formulae
BackFormulae connect variables so you can calculate unknown quantities.
FrontExample answer: Use A = lw to find A when l = 8 and w = 5.
BackA = lw = 8 × 5 = 40.
FrontCommon check for Formulae
BackCheck units/notation, compare with an estimate, and make sure the answer matches the question.
7. Finish
Complete this topic
When you have read the examples, tried the question and reviewed flashcards, claim your topic completion XP.