CAIE IGCSE Mathematics Core Upper and Lower Bounds

Practise finding the interval represented by rounded measurements and writing its inclusive lower bound and exclusive upper bound correctly.

Syllabus
2028–2030
Objective
C1.10.1
Level
Core

Exam points

  • find half the stated rounding unit and subtract it to obtain the inclusive lower bound
  • add half the rounding unit to obtain the exclusive upper bound for the original value
  • write the interval as lower bound ≤ variable < upper bound with consistent units

C1.10.1 Give upper and lower bounds for data rounded to a specified accuracy question 1

[Maximum number: 2]

The height, h$ metres, of a fence post is $2.43\,\mathrm{m}, correct to the nearest centimetre.
Complete the statement about the value of h$. $\leqslant h<

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