Chapter 7 Decimals Worksheet - New Century Maths Page 6
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38f Into the car jumped Charlie the dog, weighing 144 kilograms,
g happily wagging his 150 centimetres of tail.
h Maria and Fred had each packed a 200 kg backpack.
i
They stopped for a snack at McDougall’s and bought two beefburgers each, so that they
could have their daily intake of 250 kg of meat.
j After they had driven for several hours, averaging 850 kilometres per hour, they were
within sight of Mt Kosciuszko, the highest mountain in Australia,
k about 23000 m above sea level.
l
They enjoyed seeing the small eucalyptus trees about 105 m high.
m They also saw a kangaroo, which jumped about 80 m,
n 110 times the Olympic record for the long jump that was set in Mexico City.
o After a pleasant walk of 134 km they arrived back at their campsite.
p They slept soundly and, next morning, drove the 2500 km home
q in about 300 hours.
Ordering decimals
Worksheet
The number of digits after the decimal point tells us the number of decimal places in the
7-02
decimal number.
Dewey decimals
Example 6
How many decimal places are there in:
a 3.6567?
b 15.801?
Solution
a 3.6567 has four decimal places.
b 15.801 has three decimal places.
1 23
1 23 4
Example 7
Arrange these numbers in ascending order (smallest to largest):
67.41
67.14
6.714
67.04
Solution
To compare decimals more easily, insert zeros at the end to give all the numbers the same
amount of decimal places.
67.41
67.14
6.714
67.04
become:
67.410
67.140
6.714
67.040
In ascending order: 6.714, 67.04, 67.14, 67.41
Example 8
Arrange these numbers in descending order (largest to smallest):
0.5
0.08
1.7
0.85
Solution
0.5
0.08
1.7
0.85
become:
0.50
0.08
1.70
0.85
In descending order: 1.7, 0.85, 0.5, 0.08
203
DECIMALS
CHAPTER 7
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