Bounds in Calculations (Key for Exam!)
Part of Bounds & Error Intervals · GCSE GCSE Mathematics revision
This deep dive covers Bounds in Calculations (Key for Exam!) within Bounds & Error Intervals for GCSE Mathematics. Revise Bounds & Error Intervals in Number for GCSE Mathematics with 14 exam-style questions and 5 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 5 of 7 in this topic. Use this deep dive to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 5 of 7
Practice
14 questions
Recall
5 flashcards
Bounds in Calculations (Key for Exam!)
| To find... | Use... |
|---|---|
| Maximum of A + B | UB(A) + UB(B) |
| Minimum of A + B | LB(A) + LB(B) |
| Maximum of A − B | UB(A) − LB(B) |
| Minimum of A − B | LB(A) − UB(B) |
| Maximum of A × B | UB(A) × UB(B) |
| Minimum of A × B | LB(A) × LB(B) |
| Maximum of A ÷ B | UB(A) ÷ LB(B) |
| Minimum of A ÷ B | LB(A) ÷ UB(B) |
Memory trick: For division, it's the OPPOSITE - to make a fraction big, make the top big and bottom small!
Keep building this topic
Read this section alongside the surrounding pages in Bounds & Error Intervals. That gives you the full topic sequence instead of a single isolated revision point.
Practice Questions for Bounds & Error Intervals
A length is 240 cm to the nearest 10 cm. What is the lower bound of the length?
A mass m is 45 kg to the nearest kilogram. Write down the error interval for m using inequality notation.
Quick Recall Flashcards
14 questions on Bounds & Error Intervals — practise free
Instant marking, adaptive difficulty, and 5 spaced repetition flashcards. Free until your GCSEs.
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