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IGCSEMathsCambridge (CIE)International MathsCoreExam QuestionsNumberRounding & Estimation

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

30 mins20 questions
Easy
Medium
Hard
1
Sme Calculator1 mark

Write 0.3728 correct to 1 decimal place.

[1]

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2
Sme Calculator1 mark

Write 867 correct to the nearest ten.

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3
Sme Calculator1 mark

Write 849.481 correct to 1 decimal place.

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4
Sme Calculator1 mark

Write 97.4236 correct to 3 decimal places.

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5
Sme Calculator1 mark

Write 3.72194 correct to 3 decimal places.

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6
Sme Calculator1 mark

Write 8379 correct to the nearest hundred.

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7a
Sme Calculator1 mark

Write 6789 correct to the nearest 100.

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7b
Sme Calculator1 mark

Write 6789 correct to 3 significant figures.

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8a
Sme Calculator1 mark

Write 8473 correct to the nearest ten.

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8b
Sme Calculator1 mark

Write 16.086 correct to 2 decimal places.

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9
Sme Calculator1 mark

Write 3.058 correct to 3 significant figures.

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1
Sme Calculator2 marks

By writing each number correct to 1 significant figure, estimate the value of

fraction numerator 37.8 cross times 13.2 over denominator 28.5 plus 22.1 end fraction

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2
Sme Calculator2 marks

By rounding each number correct to 1 significant figure, estimate the value of

fraction numerator 71 cross times 32.4 over denominator 4.8 squared end fraction

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3
Sme Calculator2 marks

Calculate cube root of 40

Give your answer correct to 4 decimal places

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4
Sme Calculator2 marks

By rounding each number correct to 1 significant figure, show that an estimate for this calculation is 20.

fraction numerator 9.78 plus 31.562 over denominator 0.381 cross times 5.09 end fraction

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5
Sme Calculator1 mark

Write 0.047883 correct to 2 significant figures.

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6
Sme Calculator1 mark

Write 6.8167 correct to 3 significant figures.

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1
Sme Calculator2 marks

T equals fraction numerator 49.2 minus 9.59 over denominator 4.085 cross times 2.35 end fraction

By writing each number correct to 1 significant figure, work out an estimate for T.
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2
Sme Calculator2 marks

By rounding each number correct to 1 significant figure, estimate the value of square root of fraction numerator 90006 over denominator 10.01 squared end fraction end root

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3
Sme Calculator2 marks

p equals fraction numerator 1.6 plus 9.6 squared over denominator 5.9 minus 4.3 end fraction

By writing each number correct to 1 significant figure, work out an estimate for p.
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4
Sme Calculator1 mark

Write 0.046875 correct to 2 significant figures.

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5
Sme Calculator2 marks

Without using a calculator, estimate, by rounding each number correct to 1 significant figure,

fraction numerator square root of 104.3 end root over denominator 8.72 minus 7.389 end fraction

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