year 8 maths

3A
Length and perimeter
121
Exercise 3A
REVISION
UNDERSTANDING AND FLUENCY
1–4, 5–6(½) 4, 5–7(½)
5–7(½)
1 Write the missing number in these sentences.
a There are ___ mm in 1 cm . b There are ___ cm in 1 m .
c There are ___ m in 1 km . d There are ___ cm in 1 km .
e There are ___ mm in 1 m . f There are ___ mm in 1 km .
2 Evaluate the following.
a 10 × 100 b 100 × 1000 c 10 × 100 × 1000
3 Find the value of x in these diagrams.
a
b
x m c
x m
x m
10 cm
7 m
12 m
14 m
3 m
4 Find the perimeter of these quadrilaterals.
a square with side length 3 m b rectangle with side lengths 4 cm and 7 cm
c rhombus with side length 2.5 mm d parallelogram with side lengths 10 km and 12 km
e kite with side lengths 0.4 cm and 0.3 cm f trapezium with side lengths 1.5 m, 1.1 m, 0.4 m
and 0.6 m
Example 1
5 Convert these measurements to the units shown in the brackets.
a 3 cm (mm) b 6.1 m (cm) c 8.93 km (m) d 3 m (mm)
e 0.0021 km (m) f 320 mm (cm) g 9620 m (km) h 38000 cm (km)
i 0.0043 m (mm) j 0.0204 km (cm) k 23098 mm (m) l 342000 cm (km)
m 194300 mm (m) n 10000 mm (km) o 0.02403 m (mm) p 994000 mm (km)
Example 2
6 Find the perimeter of these shapes.
a
b
c
5 m
6 m
7 m
3 cm
d
8 m
10 cm
e
15 m
f
1 cm
5 cm
3 cm
8 km
5 km
1 km
4 cm
2 cm
g
h 4.3 cm i
7.2 mm
5.1 m
9.6 m
2.8 mm
Cambridge Maths NSW
Stage 4 Year 8 Second edition
ISBN 978-1-108-46627-1 © Palmer et al. 2018
Cambridge University Press
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