This key facts covers Key Terminology 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 2 of 6 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 2 of 6
Practice
14 questions
Recall
5 flashcards
Key Terminology
| Term | Meaning | Example (8.3 to 1 d.p.) |
|---|---|---|
| Lower Bound (LB) | Smallest value that rounds to the given value | 8.25 |
| Upper Bound (UB) | Smallest value that would round UP | 8.35 |
| Error Interval | Range written as inequality | 8.25 ≤ x < 8.35 |
Note: Lower bound uses ≤ (could be exactly this), Upper bound uses < (never reaches this)