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Bounds & Error Intervals

Revise Bounds & Error Intervals in Number for GCSE Mathematics with 14 exam-style questions and 5 flashcards. This is a high-frequency exam topic, so students should expect to explain it clearly under timed conditions.

Study this topic

1

The Hidden Range

Introduction2

Key Terminology

Key Facts3

Finding Bounds

Deep Dive4

Worked Example 1

Notes5

Bounds in Calculations (Key for Exam!)

Deep Dive6

Worked Example 2: Bounds in Division

Notes

Sample Flashcards

Max of A ÷ B
Max = UB(A) ÷ LB(B). Big top, small bottom = big answer
Rationalising
Remove surd from denominator: 1/√2 = √2/2

Sample Questions

A length is 240 cm to the nearest 10 cm. What is the lower bound of the length?

  • A. 230 cm
  • B. 235 cm
  • C. 239 cm
  • D. 245 cm
1 markfoundation

A mass m is 45 kg to the nearest kilogram. Write down the error interval for m using inequality notation.

2 marksfoundation

14

exam-style questions

5

revision flashcards

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Surds