Page 12 - Math Smart - 7

€ Investigate!

in a car park in Singapore in 2016, the parking charges were
$3.00 for each hour of parking. For every hour that your car is parked,
you need to pay another $3.00.
This means that the price of parking will go up in multiples of 3.

s Figure 1.1 Parking 3 6 9 12 15
charges are $3.00 for
(1 X 3) (2X3) (3X3) (4X3) (5X3)
each hour of parking
s Figure 1.2 Car parking charges over a period of 5 hours at $3.00 per hour
O In 2019, the car park charges increased to $4.00 per hour.
Complete the table.

Number of hours Cost ($)
1
2
3
5

11
Q Find a carpark in your city. Calculate the cost of parking a car there from
8 a.m. to 10 p.m. Write a sentence to describe the cost using the word
'multiple'.

Example 2

o Spotlight List the first four multiples of 12.
12 X 1 = 12
12 X 2 = 24
There is an infinite
12 X 3 = 36
number of multiples for
12 X 4 = 48
any natural number.
So, the first four multiples of 12 are 12, 24, 36 and 48.
List the multiples of 24 between 23 and 97.
24 X 1 = 24
24 X 2 = 48
24 X 3 = 72
24 X 4 = 96
24 X 5 = 120
We are looking for the multiples between 23 and 97. So, we can stop at
the 5*'' multiple of 24, which is 120.
So, the multiples of 24 between 23 and 97 are 24, 48, 72 and 96.

UNIT 1 Factors, Multiples and Primes