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GCSE Mathematics · key term
An inequality showing the range of original values that could have produced a stated rounded or truncated value.
Used by AQA, Edexcel and OCR
Specification N15, N16 · Paper 1, Paper 2, Paper 3
Revise: Rounding and AccuracyThis range is an error interval.
The range containing every possible original value that could have produced a stated rounded value.
Specification N15, N16 · Paper 1, Paper 2, Paper 3
A range of possible original values represented using inequalities.
Revise: Rounding and Error IntervalsAn error interval should describe exactly the values that produce the stated result. Test a value just inside each end and the excluded endpoint.
The range of possible exact values represented by a rounded value, written using inequalities.
Specification 4.01c · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Foundation), Paper 4 (Higher), Paper 5 (Higher), Paper 6 (Higher)
The interval of possible actual values that could have produced a stated rounded or truncated value.
Revise: Error Intervals and BoundsAn error interval records all possible actual values using inequalities.
For an error interval, identify the rounding or truncation step first. When rounding, halve this step to find the two boundary values.
Use at the lower boundary and at the upper boundary for an ordinary error interval produced by rounding.
For an error interval, first identify the place-value unit used, then find half of that unit for rounding.
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