Answers
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Exercise 1
The length of a rail is 20 metres.
Sleepers are spaced out at 100cm intervals.
How many sleepers are there to each pair of rails?
Answer: 20
Exercise 2
Complete the table
Number of rails: 1 2 3 4 5
6 7 8 9 10
Number of sleepers: 20 40 60 80 100 120 140 160 180 200
Exercise 3
The tank holds 6000 litres. It is half empty. How many litres of water are needed to top
up the tank?
Answer: 3000
Water flows through the hose at a rate of 600 litres per minute. How many minutes does it
take to fill the empty tank?
Answer: 10
Lady Ingrid uses 1000 litres per hour. In how many hours' time will the tank have to be
filled up again?
Answer: 6
Exercise 4
Complete the table
Water consumption
time: 1 minute 2 minutes 3 minutes 6 minutes 1 hour
litres: 100 200
300 600 6000
Exercise 5
Lady Ingrid's bunker holds 400kg of coal. She uses 100kg of coal per hour. How many hours
does the coal in the bunker last?
Answer: 4
The fireman's shovel holds 2kg of coal. How many shovelfuls of coal does the bunker hold?
Answer: 200
Exercise 6
Coal costs ú60 per tonne. If Lady Ingrid used 100kg of coal per hour, what would this
cost?
Answer: ú6
If Lady Ingrid's bunker held 400kg of coal, how much would it cost?
Answer: ú24
Exercise 7
Complete the table.
What is the maximum number of coaches which a train can have if the coaches are to fit
into a station?
Lengths are in metres.
Coaches Station Max. number of coaches
20 40
2
20 57
2
20 80
4
22 90
4
Exercise 8
Estimating
Height of wall - 12 boards x 16cm.
Answer: 192cm
Height of truck - 12 boards x 17cm.
Answer: 204cm
Length of fence - 40 x (8cm + 8cm).
Answer: 640cm
Length of platform - 1000 x 10cm.
Answer: 100m
Exercise 1
The length of a rail is 18 metres.
Sleepers are spaced out at 60cm intervals.
How many sleepers are there to each pair of rails?
Answer: 30
Exercise 2
Complete the table
Number of rails: 1 2 3
4 5 6 7 8 9
10
Number of sleepers: 25 50 75 100 125 150 175 200 225 250
Exercise 3
The tank holds 6000 litres. The tank is filled when 1000 litres are left in it. How many
litres of water are needed to top up the tank?
Answer: 5000
Water flows through the hose at a rate of 500 litres per minute. How many minutes does it
take to fill the empty tank?
Answer: 10
Lady Ingrid uses 1000 litres per hour. Her tank will be topped up when it has 1000 litres
left. In how many hours' time will the tank have to be filled up again?
Answer: 5
Exercise 4
Complete the table
Water consumption
time: 1 minute 2 minutes 3 minutes 6 minutes 1 hour
litres: 140
280
420 840 8400
Exercise 5
Lady Ingrid's bunker holds 360kg of coal. She uses 90kg of coal per hour. How many hours
does the coal in the bunker last?
Answer: 4
The fireman's shovel holds 2kg of coal. How many shovelfuls of coal does the bunker hold?
Answer: 180
Exercise 6
Coal costs ú66 per tonne. If Lady Ingrid used 100kg of coal per hour, what would this
cost?
Answer: ú6.60
If Lady Ingrid's bunker held 400kg of coal, how much would it cost?
Answer: ú26.40
Exercise 7
Complete the table.
What is the maximum number of coaches which a train can have if the whole train is to fit
into a station?
Lengths are in metres.
Engine Coaches Station Max. number of coaches
20 18 40
1
20 18 57
2
12 16 80
4
22 17 102
4
Exercise 8
Estimating
Height of wall - 12 boards x 17cm.
Answer: 204cm
Height of truck - 14 boards x 15cm + 1m.
Answer: 310cm
Length of fence - 64 x (8cm + 7cm).
Answer: 960cm
Length of platform - 1100 x 9cm.
Answer: 99m
Exercise 1
The length of a rail is 18.56 metres.
Sleepers are spaced out at 64cm intervals.
How many sleepers are there to each pair of rails?
Answer: 29
Exercise 2
Complete the table
Number of rails: 1 2 3 4
5 6 7 8 9 10
Number of sleepers: 29 58 87 116 145 174 203 232 261 290
Exercise 3
The tank holds 6000 litres. The tank is filled when 1000 litres are left in it. How many
litres of water are needed to top up the tank?
Answer: 5000
Water flows through the hose at a rate of 500 litres per minute. How many minutes does it
take to fill the empty tank?
Answer: 10
Lady Ingrid uses 1000 litres per hour. Her tank will be topped up when it has 1000 litres
left. In how many hours' time will the tank have to be filled up again?
Answer: 5
Exercise 4
Complete the table
Water consumption
time: 1 minute 2 minutes 3 minutes 6 minutes
1 hour
litres: 139 278 417
834 8340
Exercise 5
Lady Ingrid's bunker holds 380kg of coal. She uses 95kg of coal per hour. How many hours
does the coal in the bunker last?
Answer: 4
The fireman's shovel holds 2.5kg of coal. How many shovelfuls of coal does the bunker
hold?
Answer: 152
Exercise 6
Coal costs ú66 per tonne. If Lady Ingrid used 90kg of coal per hour, what would this
cost?
Answer: ú5.94
If Lady Ingrid's bunker held 360kg of coal, how much would it cost?
Answer: ú23.76
Exercise 7
Complete the table.
What is the maximum number of coaches which a train can have if the whole train is to fit
into a station?
Lengths are in metres.
Engine Coaches Station Max. number of coaches
17 18 40
1
19 18 57
2
13 17 89
4
21 19 105
4
Exercise 8
Estimating
Height of wall - 12 boards x 17.5cm.
Answer: 210cm
Height of truck - 14 boards x 15.5cm + 1m.
Answer: 317cm
Length of fence - 64 x (8cm + 7.5cm).
Answer: 992cm
Length of platform - 400 x 9.5cm.
Answer: 38m
Exercise 1
Flash can carry 40kg.
Exercise 2
| Karen | : | Duskdancer |
| Tim | : | Midnight |
| Mel | : | Cloud |
| Paul | : | Skybright |
Exercise 1
Star: 30kg Flash: 40kg Total: 70kg.
Exercise 2
| Karen | : | Duskdancer |
| Tim | : | Midnight |
| Mel | : | Cloud |
| Paul | : | Skybright |
Exercise 1
Star: 32.5kg Flash: 43.5kg Total: 76kg.
Exercise 2
| Karen | : | Duskdancer |
| Tim | : | Midnight |
| Mel | : | Cloud |
| Paul | : | Skybright |