CourseCourseConceptConceptDocumentDocument

Edexcel IGCSE Math A Foundation 1.8 Degree of Accuracy Questions

Use accuracy questions to round values, estimate calculations and choose upper or lower bounds before giving suitable final answers.

Syllabus
First assessment 2018
Course
Math A 4MA1
Level
Foundation

Exam points

  • Round integers, decimals and significant figures to the accuracy stated in the question.
  • Use one-significant-figure estimates to simplify powers, roots, products and quotients.
  • Choose upper and lower bounds for measurements before calculating a suitable value.

Covered syllabus points

1.8.A Round integers to a given power of 101.8.B Rounding to significant figures or decimal places1.8.C Upper and lower bounds1.8.D Estimating numerical calculations

Question 1

[Maximum number: 2]

Question (a)

(a)

Write the number 45.621 correct to the nearest whole number.

[ 1 ]

Question (b)

(b)

Write the number 6739 correct to the nearest hundred.

[ 1 ]

Question 2

[Maximum number: 4]

The weight of a cake is 2.75 kg , correct to 2 decimal places.

Question (a)

(a)

Write down the lower bound of the weight of the cake.

[ 1 ]

Question (b)

(b)

Write down the upper bound of the weight of the cake.

Penny has worked out 81.3×59.21.92\frac{81.3 \times 59.2}{1.9^{2}} on her calculator.
Her answer is 13332.29917
Penny's answer is not sensible.

[ 1 ]

Question (c)

(c)

By rounding each number to one significant figure, work out a suitable estimate to show that her answer is not sensible.
Show your working clearly.

[ 2 ]

Question 3

[Maximum number: 1]

Write the number 6739 correct to the nearest hundred.

Question 4

[Maximum number: 1]

Write the number 45.621 correct to the nearest whole number.

Question 5

[Maximum number: 2]

The weight of a cake is 2.75 kg , correct to 2 decimal places.

By rounding each number to one significant figure, work out a suitable estimate to show that her answer is not sensible.
Show your working clearly.

All question bank results loaded