Chapter 7 Decimals Worksheet - New Century Maths Page 27
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38Decimals at work
Exercise 7-12
1 Find the cost of 352 units of electricity at 12.3 cents per unit.
2 A farmer wants to fence a rectangular paddock. The paddock is 35.6 metres long and
20.85 metres wide. How many metres of fencing will be needed?
3 Mark buys golf balls for $4.85 each and sells them for $5.15 each. How much money
does he make if he sells 30 golf balls?
4 A drink bottle holds 0.75 litres. How many drink bottles can be filled from a tub that
holds 4.5 litres?
5 A car travels 220.6 kilometres on 14 litres of petrol. How many kilometres would the car
travel on one litre of petrol? (Give the answer to one decimal place.)
6 Pamela runs 3.8 kilometres each day of the week. How far does she run in one week?
7 A long distance train is made
up of a diesel engine, two
dining cars and 15 passenger
carriages. The engine has a
mass of 20.2 tonnes, each
dining car has a mass of
14.35 tonnes and each
passenger carriage has a
mass of 13.96 tonnes. How
heavy is the entire train?
8 George is cutting shelves from a board which is 4.6 metres long. Each shelf needs to be
1.25 metres long. How many shelves can be cut?
9 Samantha ran 100 metres in 15.21 seconds. How long would Samantha take to run
400 metres at this pace?
10 Henry has a faulty calculator; it does not
Calculation
Answer
show the decimal point. For each of the
3.42 × 12
4104
calculations in the table shown on the right,
4.145 × 0.2
write the correct answer.
829
37.3 × 8.8
32824
0.03 × 157.64
47292
8.3902 × 0.3
251706
11 Mick walks to work and back each day. He works six days a week and, in one week,
walks 16.8 kilometres. How far is Mick’s apartment from work?
12 The following are calculator displays for amounts in dollars and cents. Give the answers
in dollars and cents.
a
b
c
d
1 1 1 1 5 5 5 5 . . . . 2 2 2 2 3 3 3 3 6 6 6 6
6 6 6 6 . . . . 8 8 8 8 4 4 4 4 1 1 1 1 2 2 2 2
4 4 4 4 8 8 8 8 7 7 7 7 . . . . 7 7 7 7 5 5 5 5 9 9 9 9 3 3 3 3 1 1 1 1 8 8 8 8
1 1 1 1 2 2 2 2 3 3 3 3 4 4 4 4 . . . . 0 0 0 0 4 4 4 4 7 7 7 7 1 1 1 1 2 2 2 2 6 6 6 6
13 A sheet of paper is 0.01 cm thick. How many sheets would be in a stack 4 cm high?
224
NEW CENTURY MATHS 7
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