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Error Intervals
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The basic idea

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 6.86.86.8 to 1 decimal place, the actual value could be anywhere from 6.756.756.75 up to, but not including, 6.856.856.85.

Error Intervals Lesson

  1. GCSE
  2. /Maths
  3. /Error Intervals

Step-by-step lessons on CCEA GCSE Maths Error Intervals. Each one builds up to exam-style questions. 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.