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The basic idea

Number line showing the error interval for 6.8 to 1 decimal place, with a filled dot at 6.75, an open dot at 6.85, and 6.8 in the centre

An error interval shows the range of original values that could have produced a rounded answer. If a number rounds to $6.8$ to 1 decimal place, the actual value could be anywhere from $6.75$ up to, but not including, $6.85$ .

Error Intervals Lesson

GCSE
Maths
Error Intervals

Step-by-step lessons covering Edexcel GCSE Maths Error Intervals for Foundation and Higher tier. Each lesson works through exam-style questions in Paper 1, Paper 2 and Paper 3 format. Build fluency with number, ratio and algebra first, since geometry, probability and statistics topics rely on them, and leave extra time nearer the exam for Higher-tier problem-solving and multi-step reasoning questions.

Lessons

x

The basic idea

Number line showing the error interval for 6.8 to 1 decimal place, with a filled dot at 6.75, an open dot at 6.85, and 6.8 in the centre

An error interval shows the range of original values that could have produced a rounded answer. If a number rounds to $6.8$ to 1 decimal place, the actual value could be anywhere from $6.75$ up to, but not including, $6.85$ .

Error Intervals Lesson

GCSE
Maths
Error Intervals

Step-by-step lessons covering Edexcel GCSE Maths Error Intervals for Foundation and Higher tier. Each lesson works through exam-style questions in Paper 1, Paper 2 and Paper 3 format. Build fluency with number, ratio and algebra first, since geometry, probability and statistics topics rely on them, and leave extra time nearer the exam for Higher-tier problem-solving and multi-step reasoning questions.