year 8 maths

240 Chapter 4 Fractions, decimals, percentages and financial mathematics
11 Find:
a 20% of 90 minutes b 15% of $5 c 30% of 150 kg
d 5% of 1.25 litres e 40% of 2 weeks f 75% of 4.4 km
PROBLEM-SOLVING AND REASONING 12, 13, 17 13–15, 17, 18
14–16, 18–20
12 Find:
a
33 1 % of 16 litres of orange juice
3
b 66 2 % of 3000 marbles
3
c
12 1 % of a $64 pair of jeans
2
d 37.5% of 120 donuts
13 In a survey, 35% of respondents said they felt a penalty was too lenient and 20% felt it was too
harsh. If there were 1200 respondents, how many felt the penalty was appropriate?
14 Four students completed four different tests. Their results were:
Maeheala: 33 out of 38 marks
Wasim: 16 out of 21 marks
Francesca: 70 out of 85 marks
Murray: 92 out of 100 marks
Rank the students in decreasing order of test percentage.
15 Jasper scored 22 of his team’s 36 points in the basketball
final. What percentage of the team’s score did Jasper
shoot? Express your answer as a fraction and as a
recurring decimal.
16 Due to illness, Vanessa missed 15 days of the 48 school
days in Term 1 . What percentage of classes did Vanessa
attend in Term 1 ?
17 Eric scored 66% on his most recent Mathematics test. He has studied hard and is determined to
improve his score on the next topic test, which will be out of 32 marks. What is the least number of
marks Eric can score to improve on his previous test score?
18 Calculate 40% of $60 and 60% of $40 . What do you notice? Can you explain your findings?
19 Which of the following alternatives would calculate a% of b ?
100
ab
a
A
B
C
ab
100
100b
20 Which of the following alternatives would express x as a percentage of y ?
100
xy
x
A
B
C
xy
100
100y
D
D
100a
b
100x
y
Cambridge Maths NSW
Stage 4 Year 8 Second edition
ISBN 978-1-108-46627-1 © Palmer et al. 2018
Cambridge University Press
Photocopying is restricted under law and this material must not be transferred to another party.