Page 48 - MAT KS3 Y8 Cambridge CheckPoint

4.1 Choosing suitable units

4 Mia estimates that the length of her bedroom is 20 m.
Is this a reasonable estimate? Give a reason for your answer.
5 Maha keeps chickens.
She estimates that the weight of one chicken egg is 75 g.
Is this a reasonable estimate?
Give a reason for your answer.
6 It takes Logan 2 hours to drive from his house to his brother’s house.
He estimates that the distance from his house to his brother’s house is
400 km.
Is this a reasonable estimate? Give a reason for your answer.

7 Lynn has two cats, Polly and Barney.
Lynn knows that Polly has a mass of 3 kg.
She estimates that Barney’s mass is 3 times Polly’s mass.
Work out an estimate of Barney’s mass.
8 Hassan has a jug with a capacity of 800 ml.
He estimates that his bucket holds 20 times that of his jug.
Work out an estimate of the capacity of his bucket.
Give your answer in litres.
9 Alicia has a bag that contains 12 apples.
Estimate the mass of the bag of apples.
Give your answer in kilograms.
10 Look at the notice that is shown in an elevator.
Eight adults get into the elevator. Warning!
Do you think that the elevator is overloaded? Total mass of people in elevator
Explain your answer. must NOT exceed 500 kg

In questions 11 and 12 the diagrams are drawn to scale.

11 The diagram shows a car parked in front of a building.
Estimate the length of the building.
Show how you worked out your answer.

12 The diagram shows a man standing next to a building.
Estimate the height of the building.
Show how you worked out your answer.

46 4 Length, mass and capacity