Page 21 - ACE YR IGCSE A TOP APPR' TO MATHS

3 David has a dog, its weight was 1.7 kg six months ago, correct to 1 decimal place.
Today its weight is 4.8 kg, correct to 2 significant figures.
Work out the upper bound on the percentage for the increase in his dog’s weight.

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4 A jug holds 2 litres of orange juice, correct to the nearest whole number.
A cup holds 280 millilitres of water, correct to the nearest 10 millilitres.
Calculate the lower bound for the number of cups of orange juice which can be filled from the jug.
And how much of orange juice would left?

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5 The sides of a triangle are 4.1 cm, 10.8 cm and 2.6 cm, each correct to the nearest millimetre. Calculate
the upper bound of the perimeter of the triangle.

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6 Ashley runs for 2 hours, at a speed of 8 km/h.
Both values are correct to the nearest whole number.
Work out the lower bound of the distance that Ashley has run.

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7 Aymil starts his journey with his car filled with 20 litres of fuel, correct to the nearest 5 litres. When
the car has travelled 125 km, correct to the nearest kilometres, the fuel tank is one-third full.
Find the upper bound of the number of kilometres travelled per litre of fuel.

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Cambridge IGCSE
TM
16 Ace Your Mathematics

Chapter 1A.indd 16 15/03/2022 10:27 AM