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CAIE IGCSE Mathematics Core C1.9 Estimation Questions

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

Syllabus
2028–2030
Course
Mathematics 0580
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

Question 1

[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.

Question 2

[Maximum number: 2]

Question (a)

(a)

Write 8453 correct to

[ 2 ]

Question (i)

(i)

the nearest hundred

[ 1 ]

Question (ii)

(ii)

the nearest ten.

[ 1 ]

Question 3

[Maximum number: 2]

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

67.8×2.384.803+29.87\frac{67.8 \times 2.38}{4.803+29.87}

You must show all your working.

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