Paper 1F November 2024 Foundation tier, Question 16 2 marks
Also involves Rounding
By rounding each number to one significant figure, work out an estimate for
Show your working clearly.
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Edexcel IGCSE Maths
Topic questions Number Estimation & approximation
Estimation & approximation
5 questions · 17 marks · about 20 minutes
Estimation and approximation questions
TopicEstimation & approximation▾
Edexcel 4MA1 Estimation and approximation 5 questions
Paper 2F January 2023 Foundation tier, Question 20, also on the Higher paper 4 marks
The weight of a cake is 2.75 kg, correct to 2 decimal places.
(a)
[1]
Write down the lower bound of the weight of the cake.
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(b)
[1]
Write down the upper bound of the weight of the cake.
Her answer is 13 332.299 17
Penny’s answer is not sensible.
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(c)
[2]
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.
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Paper 2H January 2023 Higher tier, Question 5, also on the Foundation paper 4 marks
The weight of a cake is 2.75 kg, correct to 2 decimal places.
(a)
[1]
Write down the lower bound of the weight of the cake.
(b)
[1]
Write down the upper bound of the weight of the cake.
Her answer is 13 332.299 17
Penny’s answer is not sensible.
(c)
[2]
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.
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Paper 2F November 2020 (R) Foundation tier, Question 19 2 marks
His answer is 139 201.9048
Without using a calculator and using suitable approximations, check that his answer is sensible. Show your working clearly.
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Paper 1F June 2019 Foundation tier, Question 3 5 marks
The table gives the surface areas, in square kilometres, of six lakes in Africa.
| Lake | Surface area (square kilometres) |
| Albert | 5299 |
| Malawi | 29 500 |
| Mweru | 5120 |
| Tanganyika | 32 600 |
| Turkana | 6405 |
| Victoria | 68 879 |
(a)
[1]
Which of these lakes has the least surface area?
(b)
[1]
Write the number 6405 in words.
(c)
[1]
Write the number 68 879 correct to the nearest thousand.
(d)
[2]
Sammy says that the surface area of Lake Malawi is about 5 
times the surface area of Lake Albert.
Is Sammy correct? Give a reason for your answer.
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