GCSE Maths
Number and ratio
revision.
Fractions, decimals, percentages, ratio, proportion, indices and standard form — the number skills every paper still tests.
Number and ratio guides
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Each box is a full revision page. The smaller line is the search students type — not the name of the guide.
Students type: recurring decimal to fraction GCSE
Open guide Revision guideBounds and error intervalsStudents type: upper and lower bounds GCSE
Open guide Revision guideStandard form calculationsStudents type: standard form multiplication GCSE
Open guide Revision guideCompound interest and depreciationStudents type: compound interest GCSE multiplier
Open guide Revision guideReverse percentagesStudents type: how to do reverse percentages GCSE
Open guide Revision guideIndices and standard formStudents type: index laws GCSE
Open guide Revision guideRatio and proportionStudents type: sharing in a ratio GCSE
Open guide Revision guideFractions, decimals and percentagesStudents type: how to do reverse percentages GCSE
Open guideFractions, decimals and percentages
Convert fluently between fractions, decimals and percentages, then use multipliers for increase, decrease and reverse percentage.
Ratio and proportion
Share amounts in a ratio, scale recipes, and distinguish direct proportion from inverse proportion with a unitary method.
Indices and standard form
Use the index laws with confidence and write large or small numbers in standard form for science-style GCSE questions.
Reverse percentages
GCSE Maths reverse percentages: recover the original from a sale price or VAT-inclusive total by dividing by the multiplier, with the method written line by line.
Compound interest and depreciation
GCSE Maths compound interest: use multiplier to the power n, not simple interest, and apply the same method to depreciation, with a full line-by-line calculation.
Standard form calculations
GCSE Maths standard-form calculations: multiply and divide by combining a-values and powers of 10, then add or subtract by matching powers, rewriting into standard form.
Bounds and error intervals
GCSE Maths error intervals: write upper and lower bounds for rounded or truncated values, then find the maximum or minimum of a calculation from those bounds.
Recurring decimals to fractions
GCSE Maths recurring decimals to fractions: set x equal to the decimal, multiply to shift the repeating block, subtract, and simplify, including one-digit and two-digit repeats.
Keep going
More GCSE Maths
in the same style.
GCSE Maths revision that treats method as the mark scheme: reverse percentages, compound interest, quadratic formula, completing the square, SOHCAHTOA, sine and cosine rules, vectors, tree diagrams and histograms, with working shown line by line.
All Maths revision