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GCSE Mathematics · key term
The smallest boundary of the possible values of a quantity.
Used by AQA, Edexcel and OCR
Specification N16 · Paper 1, Paper 2, Paper 3
The boundary at the bottom of the range of possible original values.
Revise: Limits of AccuracyOn Higher, this also includes using upper and lower bounds in calculations.
Specification N16 · Paper 1, Paper 2, Paper 3
The smallest boundary value that a rounded quantity can take; for ordinary rounding it is included in the error interval.
Revise: Limits of AccuracySubtract that half-unit from the rounded value for the lower bound and add it for the upper bound.
Specification 4.01c · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Foundation), Paper 4 (Higher), Paper 5 (Higher), Paper 6 (Higher)
Revise: Error Intervals and BoundsDo not simply insert all lower bounds or all upper bounds: ask how each input affects the result.
For a quotient of positive quantities, the upper bound uses the upper-bound numerator and lower-bound denominator; the lower bound uses the lower-bound numerator and upper-bound denominator.
For a rounded continuous quantity, include the lower bound but exclude the upper bound: use on the left and on the right.
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