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GCSE Mathematics · key term
A value written without rounding or approximation, such as a simplified fraction rather than a rounded decimal.
Used by AQA, Edexcel and OCR
Specification N8 · Paper 1, Paper 2, Paper 3
Revise: Exact Calculations with FractionsFractions are therefore useful for preserving exact values throughout a calculation.
A value given without rounding or discarding digits, such as 5π rather than an approximate decimal.
If a question asks for an exact value, give a fraction or surd rather than a rounded decimal.
When using an exact value to calculate a length, keep surds and fractions exact throughout and simplify only at the end.
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Specification N8, G21 · Paper 1, Paper 2, Paper 3
A value written without rounding, for example as a simplified fraction, a surd or a multiple of .
Revise: Exact Calculations and SurdsAn exact value preserves the complete value of a number.
A value written without rounding, usually using integers, fractions and surds rather than a decimal approximation.
Specification 3.01b, 3.03a, 3.03b · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Foundation), Paper 4 (Higher), Paper 5 (Higher), Paper 6 (Higher)
A value written without rounding or approximation, such as , or .
A value written without rounding or approximation, such as a fraction, a surd or an expression containing .
A value written without rounding or truncation; for example, is exact whereas is an approximation.