Gcse Grade C Exam Practice Worksheet With Answer Key - Alperton Community School Page 2
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28Number: Approximation, Estimation
*1.
Use your calculator to work out the value of
−
×
3
(
. 7
91
81
)
. 4
32
+
. 6
23
. 1
491
Give your answer correct to 3 significant figures.…………………………
(Total 3 marks)
2.
Each side of a regular pentagon has a length of 101 mm, correct to the nearest
millimetre.
(i)
Write down the least possible length of each side................. mm
(ii)
Write down the greatest possible length of each side................. mm
(Total 2 marks)
×
. 6
27
. 4
52
*3.
Use your calculator to work out the value of
+
. 4
81
. 9
63
(a)
Write down all the figures on your calculator display...........................
(2)
(b)
Write your answer to part (a) to an appropriate degree of accuracy..........................
(1)
(Total 3 marks)
4.
On average, Nick walks 18 000 steps every day. He walks 1 mile approximately every
3500 steps. Work out an estimate for the average distance, in miles, that Nick walks in one
year.
.............................. miles (Total 3 marks)
637
5.
Work out an estimate for the value of
×
3
2 .
9
8 .
……………………..(Total 2 marks)
2
*6.
(a)
Work out the value of 3.8
–
Write down all the figures on your calculator
75
display.
…………………….(2)
(b) Write your answer to part (a) correct to 1 significant figure.………(1) (Total 3
marks)
Alperton Community School Maths Department: GCSE Grade C Exam Practice
2
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