🔢 GCSE Number
Master essential number skills with free exam-style questions and step-by-step worked solutions. From fractions to standard form, build the numerical fluency that underpins all GCSE Maths.
What is GCSE Number?
The Number topic forms the foundation of GCSE Maths. Strong number skills make every other topic easier to understand. You'll use fractions in algebra, percentages in statistics, and ratio in geometry.
Key areas include:
- Fractions, decimals & percentages – converting and calculating with all three
- Ratio and proportion – sharing quantities and scaling problems
- Factors, multiples & primes – HCF, LCM, and prime factorisation
- Powers and roots – indices, surds, and standard form
- Rounding and estimation – significant figures and bounds
📚 Number Topics
➗ Fractions
Add, subtract, multiply, and divide fractions. Convert between fractions, decimals and percentages.
💯 Percentages
Calculate percentages, percentage change, reverse percentages, and compound interest.
⚖️ Ratio & Proportion
Simplify ratios, share amounts, and solve direct and inverse proportion problems.
🔍 HCF & LCM
Find highest common factors and lowest common multiples using prime factorisation.
🔬 Standard Form
Write very large and very small numbers in standard form. Calculate with standard form.
📈 Indices (Powers)
Apply index laws, work with negative and fractional indices.
√ Surds
Simplify surds, rationalise denominators, and calculate with exact values.
📏 Bounds & Error
Calculate upper and lower bounds. Understand error intervals and truncation.
💡 Number Tips for GCSE Success
1. Know your times tables: Quick mental arithmetic saves time and reduces errors.
2. Learn key conversions: Memorise common fraction-decimal-percentage equivalents (½ = 0.5 = 50%).
3. Use estimation: Always estimate your answer first to check if your final answer is sensible.
4. Show your working: Even for "easy" number questions, showing method can earn partial marks.