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 OCR GCSE Maths Error Intervals for Foundation and Higher tier. Each lesson works through exam-style questions in the written papers 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 OCR GCSE Maths Error Intervals for Foundation and Higher tier. Each lesson works through exam-style questions in the written papers 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.