GCSE & iGCSE Error Intervals & Bounds worksheet

Error intervals and bounds worksheet for GCSE and iGCSE maths: truncation, error intervals, upper and lower bounds. Foundation and Higher, with solutions.

A complete error intervals and bounds worksheet for Pearson Edexcel GCSE (1MA1) and International GCSE (4MA1), written so one resource works for both tiers. Every section is clearly labelled Foundation or Higher, and questions get harder as you go.

What’s covered — Foundation

Writing the error interval for a rounded number using inequalities
Writing the error interval for a truncated number
Finding lower and upper bounds of measurements

What’s covered — Higher (grades 6 to 9)

Finding bounds of calculations
Deciding which bounds to combine
Justifying a suitable degree of accuracy

How it’s structured

A. Worked examples & Your turn — a model solution beside a matching question to try
B. Fluency — core skills
C. Reasoning — explain it
D. Problem solving — unfamiliar, multi-step questions
E. Exam practice — exam-style questions with mark allocations

108 marks across Sections B to E (54 Foundation, 54 Higher), with a progress tracker on the front page so students can record their score per section. The Higher bounds questions make students decide which bound to use in each part of a calculation, which is the step most mark schemes hinge on.

How to use it

Works as a full lesson, homework, a cover lesson or targeted intervention. Because each tier is labelled, you can set the Foundation sections to one group and the Higher sections to another from the same print.

What’s included

13-page worksheet (PDF, printable, with answer spaces)
6-page full worked solutions (PDF) — complete method for every question, not just final answers
Calculator only where shown

Specification

Pearson Edexcel GCSE Mathematics (1MA1) and International GCSE Mathematics (4MA1), Number. All questions are original.