WorkSHEET 7.2
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Length and perimeter
Name: ___________________________
Complete the following metric conversions.
(a) 7 cm =
mm
(b) 3 km =
m
(c) 14 m =
cm
(d) 8.4 m =
cm
(a)
(b)
(c)
(d)
7  10 = 70 mm
3  1000 = 3000 km
14  100 = 1400 cm
8.4  100 = 840 cm
Complete the following metric conversions.
(a) 300 mm =
cm
(b) 2000 m =
km
(c) 150 mm =
cm
(d) 480 cm =
m
(a)
(b)
(c)
(d)
300  10 = 30 cm
2000  1000 = 2 km
150  10 = 15 cm
480  100 = 4.8 m
Complete the following metric conversions.
(a) 9.2 m =
cm
(b) 56 000 mm = m
(c) 2.1 km =
cm
(d) 6000 cm =
km
(a)
(b)
(c)
(d)
9.2  100 = 920 cm
56 000  1000 = 56 m
2.1  100 000 = 210 000 cm
6000  100 000 = 0.06 km
Convert the following to the units indicated.
(a) 4.9 m to cm
(b) 1800 mm to cm
(c) 0.05 km to cm
(d) 5.8 m to mm
(a)
(b)
(c)
(d)
4.9  100 = 490 cm
1800  10 = 180 cm
0.05  100 000 = 5000 cm
5.8  1000 = 5800 mm
Express 9000 mm as:
(a) centimetres
(b) metres
(c) kilometres.
(a)
(b)
(c)
9000  10 = 900 cm
9000  1000 = 9 m
9000  1000 000 = 0.009 km
Arrange the following in descending order:
8500 cm, 12 000 mm, 0.4 m, 1.3 km, 4000 m.
4000 m, 1.3 km, 8500 cm, 12 000 mm, 0.4 m
Maths Quest 7 for Victoria 2nd Ed.
Chapter 7 Length and perimeter WorkSHEET 7.2
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Subtract the second length from the first, giving
your answer in the smallest unit.
(a) 4.1 km and 3800 m
(a)
4.1  1000 = 4100 m
4100  3800 = 300 m
(b) 37 mm and 2 cm
(b)
2  10 = 20 mm
37  20 = 17 mm
(c) 140 m and 3570 cm
(c)
140  100 = 14 000 cm
14 000  3570 = 10 430 cm
(d) 24.1 m and 7800 mm
(d)
24.1  1000 = 24 100 mm
24 100  7800 = 16 300 mm
A Christmas tree is 2.06 m high. A star that is
55 mm high is placed on top of the tree. Find
the total height in centimetres.
2.06  100 = 206 cm
55  10 = 5.5 cm
206 + 5.5 = 211.5 cm
The Christmas tree is now 211.5 cm high.
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The trunk of a tree has been cut up to make
firewood. If there are 18 logs all measuring
57 cm in length, find the original height of the
trunk in metres.
18  57 = 1026 cm
1026  100 = 10.26 m
On a pair of stilts, Harry the Clown is 3.2 m
tall. How tall is Harry, if the stilts are 85 cm
high?
3.2  100 = 320 cm
320 – 85 = 235 cm
The tree was 10.26 m tall.
Harry is 235 cm or 2.35 m tall.
Maths Quest 7 for Victoria 2nd Ed.
Chapter 7 Length and perimeter WorkSHEET 7.2
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