Frequently asked questions
Who is Solid Number for?
The lessons are written for Hong Kong students studying Number and Algebra in English at Secondary 2–3.
Where should I start?
Start with Numbers & Estimation, then Percentage, Rate & Ratio, then Algebraic Manipulation, then Equations & Inequalities.
How should I revise?
Read one worked example, cover the solution, attempt the practice questions, then complete the multiple-choice review quiz and keep a short error log.
Can I suggest a topic?
Email support@solidnumber.online with the topic or question you would like us to improve.
Browse by category
Directed numbers, approximate values, primes and scientific notation.
Percentage change, successive %, rate, ratio and proportion.
Expressions, indices, identities, expansion and factorisation.
Linear equations, inequalities and changing the subject.
TSA-style mixed drills and harder Number & Algebra problems.