CAIE IGCSE Mathematics Core C1.9 Estimation Question Bank

Practise rounding numbers to stated accuracy and using 1 significant figure approximations to estimate values before calculating.

Syllabus
2028–2030
Topic
C1.9
Level
Core

Exam points

  • round integers and decimals to a named place value, decimal place or significant figures
  • estimate calculations by replacing each number with a 1 significant figure value
  • show rounded substitutions before evaluating products, quotients and mixed operations

Covered syllabus points

C1.9.1 Round values to a specified degree of accuracy.C1.9.2 Make estimates for calculations involving numbers, quantities andC1.9.3 Round answers to a reasonable degree of accuracy in the context of a

C1.9 Estimation question 1

[Maximum number: 1]

Roberto and his family fly from London to Los Angeles on a holiday.

The family visit a national park which has an area of 4986 km24986 \mathrm{~km}^{2}.

Write 4986 correct to the nearest hundred.

C1.9 Estimation question 2

[Maximum number: 2]

By writing each number in the calculation correct to 1 significant figure, find an estimate for the value of

2.7×42.48.6−4.3\frac{2.7 \times 42.4}{8.6-4.3}

You must show all your working.

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