Cambridge IGCSE Mathematics practice

exam practice - Determine the upper and lower bounds for measurements that have been rounded, such as identifying the upper bound of a length measured to the nearest metre. Additionally, calculate the upper and lower bounds for results derived from calculations that involve rounded data, including finding the upper bound of the perimeter or area of a rectangle with dimensions rounded to the nearest centimetre, and determining the lower bound of speed based on rounded distance and time values. - Limits of accuracy

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Paper

Marks

Topic

Limits of accuracy

Exam-style question

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Paper 2Core or Extended Mathematics2 marks

Calculating bounds for a rectangle

Description

A rectangle has a length of 6 m and a width of 4 m, both measured to the nearest metre.

a
Calculate the upper bound of the area of the rectangle.
Your answer
Aim for approximately 2 distinct marking points.
[2]

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Topic focus: Limits of accuracy.
Question style: structured_mathematics.
Reasoning demand: reasoning.
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Paper 2Core or Extended Mathematics2 marks

Description

A car travels a distance of 150 km in 2 hours, both rounded to the nearest whole number.

a
Calculate the lower bound of the speed of the car.
Your answer
Aim for approximately 2 distinct marking points.
[2]