This study notes covers Worked Example 2: Bounds in Division 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 6 of 7 in this topic. Use this study notes to connect the idea to the wider topic before moving on to questions and flashcards.
Worked Example 2: Bounds in Division
Distance = 100 km (nearest 10 km), Time = 2 hours (nearest hour). Find the minimum speed.
Step 1 Find bounds for each
Distance: LB = 95, UB = 105
Time: LB = 1.5, UB = 2.5
Step 2 For minimum speed = min distance ÷ max time
Min speed = LB(distance) ÷ UB(time)
= 95 ÷ 2.5 = 38 km/h
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.