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Rounding & Estimation (Cambridge (CIE) IGCSE International Maths: Extended): Exam Questions

17 mins13 questions
Easy
Medium
Hard
1
Sme Calculator1 mark

Write 1.8796 correct to 4 significant figures.

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2
Sme Calculator1 mark

Write 0.046875 correct to 2 significant figures.

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3
Sme Calculator1 mark

Write the number 0.076499 correct to 2 significant figures.

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4
Sme Calculator1 mark

Write 0.047883 correct to 2 significant figures.

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5
Sme Calculator1 mark

Write 1.8972 correct to 2 decimal places.

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6
Sme Calculator1 mark

Write 209 802 correct to the nearest thousand.

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7
Sme Calculator1 mark

Write 4123 correct to 3 significant figures.

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1
Sme Calculator1 mark

Write 57.3997 correct to 4 significant figures.

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2a
Sme Calculator1 mark

Calculate square root of 2.38 plus 6.4 squared end root, writing down your full calculator display.

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2b
Sme Calculator1 mark

Write your answer to part (a) correct to 4 decimal places.

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3
Sme Calculator1 mark

Write the number 10 100 correct to 2 significant figures.

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1
Sme Calculator2 marks

Calculate.

fraction numerator 16.379 minus 0.879 over denominator 4.2 end fraction cross times 1.241

Give your answer correct to 2 significant figures.

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2
Sme Calculator2 marks

T space equals space fraction numerator 49.2 space minus space 9.50 over denominator 4.085 space cross times space 2.35 end fraction

By writing each number correct to 1 significant figure, work out an estimate for T.
You must show all your working.

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3
Sme Calculator2 marks

i) 29 parcels each have a value of $68.   By writing each of these numbers correct to 1 significant figure, find an estimate for the total value of these 29 parcels.  

$ .................................................. [1]

ii) Without doing any calculation, complete this statement.  

The actual total value of these 29 parcels is less than the answer to part (i)

because ...................... [1]

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