year 8 maths

Semester review 1 341
8 Find the value of x in these triangles. Round to two decimal places for part b .
a
b
x
x
5
8
12
12
9 Write these times using 24-hour time.
a 3:30 p.m. b 7:35 a.m.
Extended-response question
A square sheet of metal measuring 15 m by 15 m has equal squares of sides x m cut from each
corner, as shown. It is then folded to form an open tray.
a What is the length of the base of the tray? Write an expression.
b What is the height of the tray?
c Write an expression for the volume of the tray.
d If x = 1 , find the volume of the tray.
e What value of x do you think produces the maximum volume?
x
x
15 m
x
Chapter 4: Fractions, decimals, percentages and financial
mathematics
Multiple-choice questions
150
1 simplifies to:
350
6
3
15
3
75
A
B
C
D
E
14
70
35
7
175
3
2 Sienna spends of her $280 income on clothes and saves the rest. She saves:
7
A $470 B $120 C $160 D $2613 E $400
3 0.008 × 0.07 is equal to:
A 0.056 B 0.0056 C 0.00056 D 56 E 0.56
4 0.24 expressed as a fraction is:
A
1
24
B
25
6
C
12
5
D
24
10
E
6
25
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.