PL BM P5L37 Rate WS (2022) (1)

Primary 5: Boost! Math

Primary 5

Boost! Math

Name Rate (Lesson 37)
Tutor Rate (Lesson 37)
Topic

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Primary 5: Boost! Math

Exercise 1: Solve the following questions. The use of calculators is not allowed
for this exercise.

1. Jean can fold 10 paper crane in 5 minutes. How many paper cranes can he fold in
12 minutes?

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2. Finn can peel 6 potatoes in 10 minutes. How many potatoes can he peel in 25
minutes?

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3. At a supermarket, walnuts are sold at $2.90 for every 100g.
How much does 1.5 kg of cashew nuts cost?

Ans:

4. 6 pens cost $15. What is the cost of 8 pens?

1Ans:

Primary 5: Boost! Math

5. A machine can produce 30 m of ribbon in 12 minutes.
a) How many metres of ribbon can it produce in 1 hour?
b) How long will it take to produce 75 m of ribbon?

Ans: (a)
(b)

6. A taxi driver charges $3.20 for the first kilometre and 22¢ per additional 400 m.
How much must a passenger pay for a journey of 11.4 km?

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7. A tap takes 8 minutes to fill a tank which had a capacity of 40 ℓ. How long will it

take for the tap to fill a tank with a capacity of 180 ℓ completely?

Ans:

2

Primary 5: Boost! Math

8. Mr Tan can build a chair in 3 days. Mr Lee can build the same chair in 6 days.
How many days would it take for the both of them to build a chair together?

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9. Tap A can fill a tank in 2 hours. Tap B can fill the same tank in 5 hours. How long

will it take both Taps A and B to fill the tank at the same time?

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10. 4 men can paint a house in 3 days. How many days does it take 6 men to paint 10

such houses?

3Ans:

Primary 5: Boost! Math

Exercise 2: Solve the following questions. The use of calculators is allowed for
this exercise.

1. A telecommunications company charges the following rates for talk time.

The first minute $0.20
For every additional 30s or part thereof $0.18

How much will Wayne be charged for a call that lasted 5 minutes 40 seconds?

Ans:

2. The table below shows the rate of fines imposed on a library on overdue books.

For the first 7 days 15 cents per day

For every subsequent day 40 cents per day

Mike had to pay a total of $6.90 for two overdue books. How many days were the
books overdue?

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3. The figure shows a rectangular tank already filled with some water.
The water from the tap flows at a rate of 3.5 litres per min.
How long would it to fill the tank completely with water?

16 cm 40 cm
25 cm

70 cm

4Ans:

Primary 5: Boost! Math

4. The table below shows the rates charged for the use of water.

First 40 m³ $1.19 per m³
Next 30 m³ $1.46 per m³
After 70 m³ $1.75 per m³

(a) The Brown family used 52 m³ of water in July. How much did they pay for
the usage of water in July?

(b) Mr. Wong and his family paid $166.65 for the usage of water inAugust. How
many cubic metres (m³) of water did they use in August?

Ans: (a) (b)

5. The table below shows the parking charges at ABC Mall..

Between 7 a.m. to 6 p.m. $2.20
For the first hour

For every subsequent 30 min or part thereof $0.90

After 6 p.m. (Per entry) $4.50

Alvin parked his car at the car park. He left the car park at 6.45 p.m. and paid a total
of $18.40. What time did Alvin enter the car park?

5Ans

Primary 5: Boost! Math

6. The table shows the local postage rates. Rates
$0.30
Mass Not Step Over $0.50
20 g $0.90
40 g $1.20
100 g

Per additional step of 100 g or part thereof

(a) How much did Jane have to pay for postage for a 45 g package?

(b) Mark sent a 530 g package. How much did he have to pay for postage?
(a) Kelly paid $17.70 for sending a package. What was the possible maximum

mass of the package she sent?

Ans: (a)
(b)
(c)

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Primary 5: Boost! Math

7. Machines A and B had to print the same number of brochures. Machine A prints
42 more brochures than Machine B every minute. Machine A completed the
printing in 45 minutes and Machine B completed the printing in 72 minutes. Find
the total number of brochures each of the machines had to print.

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8. Joseph filled a tank with water from taps A and B. Water flows into the tank from
TapA at 3.5 litres per minute and water flowed out of the tank from Tap B at 1.5
litres per minute. Tap A was turned on first for 10 minutes, then Tap B was also
turned on. How long did it take for the tank to be completely filled?

A

50 cm B
70 cm
25 cm

7Ans: