GCSE Maths
GCSE Maths Error Intervals Exam Questions
Free GCSE Maths exam questions on Error Intervals, with full model answers. Covers writing error intervals for rounded and truncated values.
Error Intervals exam questions
1 question pack of real past exam questions with its mark scheme. Answer every question without notes, then mark your answers line by line against the mark scheme.
About GCSE Maths Error Intervals
Error Intervals is a Grade 3+ GCSE Maths topic, so it mostly comes up on Foundation tier papers. These questions suit AQA GCSE, Edexcel GCSE, OCR GCSE, WJEC GCSE, Eduqas GCSE, CCEA GCSE, Cambridge IGCSE and OxfordAQA IGCSE. Work through the pack without notes, then mark every answer against the model answers and redo any you got wrong a few days later.
What you need to know
- Rounding Half a unit either side of the value.
- Truncation From the value up to the next unit.
- Notation Use ≤ for the lower bound and < for the upper.
Common mistakes in Error Intervals
- Using ≤ for the upper bound.
- Treating truncation like rounding.
Try two Error Intervals exam-style questions
1. x = 7.4 to 1 d.p. Write the error interval. (2 marks)
Show the mark scheme answer
7.35 ≤ x < 7.45
2. y = 3.7 truncated to 1 d.p. Write the error interval. (2 marks)
Show the mark scheme answer
3.7 ≤ y < 3.8
Error Intervals FAQs
Which exam boards include Error Intervals?
These questions suit AQA GCSE, Edexcel GCSE, OCR GCSE, WJEC GCSE, Eduqas GCSE, CCEA GCSE, Cambridge IGCSE and OxfordAQA IGCSE.
What grade is Error Intervals in GCSE Maths?
It is a Grade 3+ topic, so it mostly appears on Foundation tier papers.
How should I use these Error Intervals questions?
Answer every question without notes, then check each answer against the model answers and redo the ones you got wrong.
