Chapter 7 MONEY...k sixty dollars ten cents l one hundred dollars fifty cents 20c 20c 20c 20c 5c or 50c 20c 10c 5c 5 coins 4 coins Draw simple sketches of the needed to make these

100 cents = 1 dollar

These are the coins that we use.

5 cents =5

100of a dollar or $0:05

20 of these make $1.

20 £ 5 cents = 100 cents = $1

10 cents =10


10 of these make $1.

10 £ 10 cents = 100 cents = $1

5 of these make $1.

50 cents =50


2 of these make $1.

2 £ 50 cents = 100 cents = $1

1 dollar = 100 cents 2 dollars = 200 cents

We also use $5, $10, $20, $50 and $100 notes.

When we write an amount of money using numbers, we write

number of dollars decimal point number of cents

For example, $20:45

$20:45 reads twenty dollars forty five cents.

Notice that we write 20 cents as $0:20

zero dollars twenty cents

We always write two numbers after the decimal point.

MONEYChapter 7

MONEYA

Currency is themoney in use.

We use -cent, -cent, -cent, -cent, dollar and dollar coins.

A dollar sign is written like this $, so we write dollar as $ , anddollars as $ .

5 10 20 50 1 2

1 1 2

2

In Australia we use decimal .currency

20 cents =20


5 £ 20 cents = 100 cents = $1

magentacyan yellow black

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94 MONEY (Chapter 7)

1 Write the amount of money shown, as cents. For example, is 15 cents.

a b c

d e f

g h

2 Write the amount of money shown, using a decimal point. For example, is $1:05.

a b c

d e

f g

h i

j k

EXERCISE 7A

PRINTABLEWORKSHEET


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MONEY (Chapter 7) 95

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3 Give the number of $10 notes that are needed to make

a $20


a $40


a $100


a $10

b $50

b $80

b $200

b $25

c $100

c $100

c $500

c $40

d $120

d $200

d $1000

d $85

7 Draw simple sketches of the coins and notes that would make up these amounts of money.

For example, $6:25 would look like

a 35 cents b 65 cents c 95 cents d $1:10 e $1:40

f $2:25 g $2:80 h $3:15 i $4:85 j $5:05

k $7:30 l $8:50 m $10:20 n $23:45 o $36:55

p $49:60 q $53:90 r $68:70 s $87:75 t $99:85

$5 $1 20c 5c


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8 85 cents can be shown as

a 70 cents b 95 cents c $1:20 d $1:50

e $2:30 f $2:65 g $3:80 h $4:55

9

a $15 b $40 c $65 d $90

10

a $10 b $20 c $30

11 What is the smallest value note you could use to pay for something that costs

a $1:80 b $23 c $45:10 d $16:30 e $81

f $9:60 g $79:95 h $14:75 i $38:50 j $4:10

12 David has these notes and coins in his wallet.

Sketch the notes and coins that David would use if he gave the correct money for an item costing

a 45 cents b $1:10 c $2:60 d $9:05

e $23:90 f $29:05 g $54:15 h $96:20

13 Use 1 dollar = 100 cents to find the number of cents in

a $2 b $5 c $8 d $10 e $7:60

14 Use 100 cents = 1 dollar to find the number of dollars in

a 300 cents b 600 cents c 900 cents d 1200 cents

15 Write these amounts in words. For example, $11:20 is eleven dollars twenty cents.

a $0:50 b $0:95 c $0:05 d $1:30

e $2:65 f $3:10 g $8:25 h $10:40

i $13:85 j $23:15 k $45:20 l $69:75

16 Write these amounts as numerals using a decimal point. For example, sixty three dollars fifteencents is $63:15

a seventy cents b thirty five cents

c five dollars d nine dollars eighty cents

e ten dollars ninety five cents f eighteen dollars five cents

g twenty seven dollars twenty cents h fifty dollars forty five cents

i seventy three dollars ninety cents j eighty five dollars thirty five cents

k sixty dollars ten cents l one hundred dollars fifty cents

or 50c20c 5c20c 20c 20c 20c 10c 5c

5 coins 4 coins

Draw simple sketches of the needed to make these amounts of money.least number of coins

Draw simple sketches of the needed to make these amounts of money.least number of notes

Using simple sketches of , show all the different ways of making each amount of money.notes


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Example

To calculate 85 cents + 65 cents we can do 8 5

+ 6 5

1

1 5 0

So, 85 cents + 65 cents

= 150 cents

= 100 cents + 50 cents

= $1:50 fas 100 cents = $1g

or we write 85 cents = $0:85 and

65 cents = $0:65

$ 0 : 8 5

$ 0 : 6 5

1

$ 1 : 5 0

line up the decimal pointsSo 85 cents + 65 cents = $1:50

1 These are school stationery items.

Find the cost of Example

$ 0 : 2 5 pencil

+ $ 0 : 8 0 scissors

$ 1 : 0 5

a a pencil and an eraser

b a pencil and a biro

c a pair of scissors and an eraser

d a pair of scissors and a roll of sticky tape

e a pencil, an eraser and a biro

f one of each of the items.

g List the prices of the items from most expensive to cheapest (descending order).

Example

To find the cost of a CD at $16:75 and abook at $23:40, we write these amountsone under the other with the decimalpoints lined up, then add.

1 1

$ 1 6 : 7 5 CD

$ 2 3 : 4 0 book

$ 4 0 : 1 5

The total is $40:15:

2 Ricky buys a loaf of bread costing $1:85 and a can of tunacosting $2:95. How much does he pay in total?

3 Sarah buys a pair of pliers costing $24:95 and a spanner setcosting $39:50. Find the total of her purchases.

ADDING AND SUBTRACTING WITH MONEYB

ADDITION

EXERCISE 7B

65 cents

40 cents

25 cents

35 cents

80 cents

+

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4

Find the cost of a

Example

$ 1 0 : 0 0

+ $ 1 2 : 5 0

$ 2 2 : 5 0

Polo shirtshorts

a

b sports bottle and a lunch box

c pair of school shoes and a pair of socks

d pair of joggers and a backpack

e

f

5

6

For example, to find $4:15 ¡ $1:40

3 11

$ 4 : 1 5

¡ $ 1 : 4 0

$ 2 : 7 5

7 Calculate

a $0:95

¡ $0:55

e $10:00

¡ $3:25

i $49:30

¡ $8:25

b $1:85

¡ $0:90

f $12:75

¡ $4:80

j $56:50

¡ $18:80

c $2:50

¡ $1:45

g $25:00

¡ $17:35

k $68:35

¡ $34:10

d $3:45

¡ $2:05

h $30:00

¡ $12:60

l $95:40

¡ $56:85

8

a 80 cents ¡ 40 cents

d 70 cents ¡ 35 cents

g $2 ¡ 90 cents

j $4:60 ¡ $2

b 75 cents ¡ 15 cents

e $1 ¡ 50 cents

h $2 ¡ $1:40

k $1:90 ¡ 50 cents

c 95 cents ¡ 60 cents

f $1 ¡ 65 cents

i $2:30 ¡ $1

l $3:15 ¡ $1:10

Do not forget towrite the

amounts withthe decimal

points lined up.

Megan isgettingready tostart thenew schoolyear. Hereare someitems thatshe needs.

Mia, aged , and her mother went to the theatre. The tickets cost $ for adults and $ forchildren. Find the cost of their tickets.

9 55 90 29 95: :

Taylor bought a personal CD-player for $ and two CDs at $ each. What was the total ofthese purchases?

39 95 20 85: :

$39:95

$24:50

$10

$14:95

$2 35:

$3 20:

$2 75:

$12:50

SUBTRACTION

To subtract one amount from another, we write theamounts one under the other with the larger number ontop, and the decimal points lined up. Then we subtract.

Calculate the answers. You may be able to do them mentally.

Polo shirt and a pair of shorts

pair of school shoes, a pair of joggers and two pairsof socks.

List the prices of the items in order from cheapest tomost expensive (ascending order).


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9 Tamara had 95 cents. She bought a roll of sticky tapecosting 65 cents. How much money did she have left tospend?

10 Lleyton had $1:20. He bought a pair of scissors costing 80

cents. How much of his money remained?

11 Martina had $2 and bought an icecream costing $1:80. Howmuch money remained?

12 Karam bought a salad sandwich costing $2:35. If he had$2:85 to pay for lunch, how much money was left?

13 Mohammed had a $5 note. When he paid $1:80 for a busticket, how much change was he given?

14

15 Kristy had a $50 note. If she bought a sports bag costing$35:50, how much change did she receive?

16 How much change would Cathy receive if she bought a pairof sandals costing $44:95 and paid for them using three $20

notes?

17 John spent $65:60 at the supermarket. If he tendered (gave) a$100 note, how much change did he receive?

18 Stavros compared two computer games priced at $39:95 and$58:85. What was the difference in their prices?

We have already used subtraction to find the amount of change given.

For example,

if Ming-na paid $8 to have her bicycle tyre repaired and tendered a $10

note, she would receive $10 ¡ $8 = $2 change.

Here is another way of calculating change.

For example, if the item cost 35 cents,start with $0:35

add 5 cents to give $0:40



the change is

Change

$0:05

$0:10 add

$0:50

$0:65

CALCULATING CHANGEC

AMOUNTS LESS THAN $1

Start with the cost of the item then choose coins to build the amount todollar. Start with the smallest coins first.1

Kwan had $ . If he spent $ on a DVD, how much of hismoney remained?

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1 Copy and complete the working to find the change from 1 dollar.

a 70 cents b 55 cents c 25 cents

$0:70

$0:80

$1:00

Change

$0:10

$

$

$0:55

$0:60

$

$1:00

Change

$0:05

$

$

$

$0:25

$0:30

$

$

Change

$

$

$

$

2 Find the change from 1 dollar if these amounts are spent.

a 50 cents b 65 cents c 95 cents d 10 cents

e 5 cents f 45 cents g 15 cents h 75 cents

Start with the cost of the item then find

² the number of cents to make the next whole dollar then

² the number of dollars to make the amount tendered.

For example, if Lisa gave $10 to pay for a magazine costing $3:25,

start with $3:25

add 75 cents to make the next whole dollar $4:00

add $6 to make the amount tendered $10:00

the change is

Change

$0:75add

$6:00

$6:75

3 Copy and complete the working shown to find the change from $2 if these amounts are spent.

a $1:55 b $1:20 c 85 cents

$1:55

$2:00

Change$1:20

$2:00

Change$0:85

$1:00

$2:00

Change

4 Copy and complete the working shown to find the change from $5 if these amounts are spent.

a $3:50 b $2:25 c 65 cents

$3:50

$4:00

$5:00

Change$2:25

$3:00

Change$0:65

$1:00

Change

5 Find the change from $10 when these amounts are spent.

a $6:40 b $8:75 c $4:35 d 95 cents

6 Calculate the change given if you pay for

a a box of tennis balls costing $8:25 with a $10 note

b a bunch of flowers costing $12:50 with a $20 note

EXERCISE 7C

AMOUNTS MORE THAN $1This will be easy if

you can findchange from $

quickly.1


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c a CD costing $25:25 with a $20 and a $10 note

d a haircut costing $14:30 with a $20 note

e movie tickets costing $28:40 with two $20 notes

f a vet’s bill of $37:45 for your cat, with a $50 note

g groceries costing $39:90 with a $50 note

h petrol costing $44:65 with a $50 note.

1 Find

a 3 £ $2 b 4 £ $7 c 5 £ $11 d 6 £ $8

e 9 £ $3 f 2 £ $12 g 7 £ $10 h 8 £ $9

Example

To find the total cost of 6 items at85 cents each, we find

85 £ 6 = 510 cents

= 500 cents + 10 cents

= $5:10

8 5

£ 6

3

5 1 0

2 Find the cost of

a 3 erasers @ 30 cents each

b 5 pencils @ 15 cents each

c 2 biros @ 45 cents each

d 8 chocolate frogs @ 70 cents each

e 6 raspberry chews @ 25 cents each

f 9 apples @ 65 cents each.

Example

Matthew wants to buy 3 nut bars costing $1:15 each.

To find the total cost he can

² add 3 lots of $1:15

$ 1 : 1 5

$ 1 : 1 5

$ 1 : 1 5

$ 3 : 4 5

or ² multiply $1:15 by 3.

$ 1 : 1 5

£ 3

1

$ 3 : 4 5

The total cost is $3:45.

The multiplication is the same as it is for whole numbers, but the decimal point must be kept in the sameplace in the answer as it is in the question.

MULTIPLYING AND DIVIDINGD

MULTIPLYING MONEY

EXERCISE 7D

The symbol @ isoften used instead

of the word ‘at’ whenwe are finding costs.


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Matthew works out an approximate answer like this.

$1:15 is close to $1

So 3 £ $1:15 is approximately 3 £ $1 or $3:

The cost of the nut bars will be approximately $3.

3 Find

a 3 £ $1:30

e 7 £ $2:50

i 5 £ $12:55

b 5 £ $2:10

f $3:35 £ 4

j 3 £ $32:85

c 8 £ $1:15

g 2 £ $14:60

k 4 £ $15:95

d $2:05 £ 6

h 3 £ $21:10

l $9:75 £ 8

4 Find the cost of

a 4 bottles of juice @ $2:25 each

b 3 icecreams @ $1:95 each

c 7 bus tickets @ $1:45 each

d 4 games of mini-golf @ $6:50 each

e 8 books @ $11:80 each

f 3 T-shirts @ $21:95 each

g 6 kilograms of cherries @ $12:45 per kilogram.

For amounts of money with dollars and cents, we can write the amount as cents, then divide.

For example, $8:85 = 885 cents

so $8:85 ¥ 3 = 885 ¥ 3

= 295 cents

= $2:95

or We can divide decimal numbers in the same way as whole numbers.

We keep the decimal point in the same place in the answer as it is in the question.

For example, $25:25 ¥ 5

= $5:05

$ 5 : 0 5

5 $ 2 5 : 2 5

5 Write each amount as cents, then divide.

a 90 cents ¥ 3

d $0:95 ¥ 5

g $6:95 ¥ 5

6 Find

a 3 $15:30

d $52:80 ¥ 4

b 30 cents ¥ 2

e $1:20 ¥ 4

h $6 ¥ 4

b 5 $45:20

e $89:95 ¥ 7

c 55 cents ¥ 5

f $8:40 ¥ 8

i $2:55 ¥ 3

c 9 $63:45

f $80:70 ¥ 5

7 a Find half of 90 cents.

b Sam and Joe each receive half of $1:50. How much does each boy get?

c 3 kilograms of apples cost $7:35. Find the cost of 1 kilogram of apples.

You can check your answers to multiplications by finding an first.approximate answer

DIVIDING MONEY

2 9 5

3 8 28 15


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d

e 5 children’s tickets to the Swimming Centre cost $21. Howmuch does 1 ticket cost?

f 4 pairs of sneakers cost $87:80. Find the cost of 1 pair ofsneakers.

When your parents fill their car with petrol, look at the amount to bepaid shown on the petrol pump.

It does not always end in ‘0’ or ‘5’.

How do we pay cash for an amount like $34:56 or $21:12 when thesmallest coin is

The amount will then end in

0 cents, 5 cents, 10 cents, 15 cents, 20 cents, 25 cents, ......

1 Choose the amount of money in brackets that is nearer to the amount given.

For example, $1:46 ($1:45, $1:50).

$1:45 is nearer to $1:46 than $1:50, so choose $1:45:

a 23 cents (20 cents, 25 cents) b 82 cents (80 cents, 85 cents)

c 79 cents (75 cents, 80 cents) d 36 cents (35 cents, 40 cents)

e $1:14 ($1:10, $1:15) f $1:87 ($1:85, $1:90)

g $2:58 ($2:55, $2:60) h $3:41 ($3:40, $3:45)

i $21:33 ($21:30, $21:35) j $45:99 ($45:95, $46:00)

Have you noticed that:

Amounts ending in 1 cent or 2 cents round down.Amounts ending in 3 cents or 4 cents round up to 5 cents.Amounts ending in 6 cents or 7 cents round down to 5 cents.Amounts ending in 8 cents or 9 cents round up.

So

2 Round to the nearest 5 cents.

a 87 cents b 99 cents c $1:12 d $2:14

e $4:68 f $7:92 g $10:39 h $17:45

i $22:21 j $58:96 k $43:87 l $69:53

ROUNDING TO THE NEAREST 5 CENTSE

We have to the amount .round to the nearest cents5

EXERCISE 7E

2 23 5cents rounded to centsup

8 82 0cents rounded to centsdown

7 89 0cents rounded to centsup

3 36 5cents rounded to cents.down

7 13 65 1bags of chips cost $ . How much does bag cost?:

a cent piece?5


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5 When Frances bought a bag of apples, the price shown was$2:32. She gave the shop assistant $2:50.

a How much did Frances pay for the apples?

b How much change did Frances receive?

6 When Mario filled his car with petrol, the cost shown at the petrolpump was $38:69. Mario gave the attendant two $20 notes.

a How much was Mario charged?

b How much change did Mario receive?

We can use a calculator to add, subtract, multiply and divide.

Answer

To find $56:85 + $32:20 press $89:05

To find $82:10 ¡ $27:45 press $54:65

To find $27:55 £ 3 press $82:65

To find $97:50 ¥ 3 press $32:50

Sometimes we do several operations one after the other.

For example, a movie ticket costs $8:95 for an adult and $5:60 for a child.

Cost = $8:95+

cost for 1 adultcost for 3 children

press Answer $25:75

So the cost is $25:75 .

Use a calculator to solve these problems.

1 Find the total of this grocery bill.

1 packet of cornflakes @ $4:95

1 jar of coffee @ $9:95

1 block of cheese @ $5:45

1 bag of dog food @ $14:25

4 loaves of bread @ $2:35 each

USING A CALCULATORF

3 £ $5:60

EXERCISE 7F

Find the cost of tickets for children .3 and adult1

5 6 . 8 5 3 2 . 2+ =

8 2 . 1

2 7 . 5 5 3 =

9 7 . 5

� 52 7 . 4 =

÷ 3 =

5 . 6 + 8 . 9 53 × =

Remember, when writingmoney as decimals,

write two digits after thedecimal point.

When Philip bought some sausages costing $ , he gave the butcher thecorrect rounded amount of money. How much did Philip pay?

4 57:

Gino bought a bag of capsicums costing $ . He paid withcoins. How much did he pay?

2 98:


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2

3 Find the cost of 7 bus tickets for the school excursion at $12:75

each.

4 Jake and two friends broke a window. The repairs cost $67:35.If they each paid equal shares, how much did each person pay?

Example

Eddie receives $5 a week pocket money.

What could Eddie buy without spending more than $5?

He could buy

1 icecream $1:80

1 packet of peanuts $1:45

1 cola drink $1:75

$5:00

or 2 comic books $2:50

$2:50

$5:00

or 1 comic book $2:50

1 iceblock $0:95


$4:90

but he could not buy 1 comic book $2:50

1 icecream $1:80


$5:75

1 Charlotte has $10 to spend. She has to decide which of the items shown below that she will buy.

A $7:80 B $2:75/pair C $12:95 D $3:50

a If Charlotte bought one item, which of these items could it be?

b If Charlotte bought two different items, which ones were they?

c If Charlotte bought three of the same item, which one was it?

d Could Charlotte buy 2 packets of hair ties and a pair of socks? How much would that cost her?

BUDGETSG

A is a plan to help us manage our spending.budget

EXERCISE 7G

Maria had $ . She bought two shirts costing $ each.How much change did she receive?

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2 Zac had $20 to spend on some of the items shown below.

A $3:80 B $12:75 C $15:95 D $2:75

a If Zac bought the Adventure story, could he buy a T-shirt?

b If Zac bought a T-shirt and some batteries for his CD player, how much would that cost?

c If Zac bought the Adventure story, could he buy 2 bags of crisps? Explain your answer.

d Which 3 different items could Zac buy and stay within his budget? How much change wouldhe receive?

3 Mary sees these items in the window of the Sports Store. Mary would like to play tennis. She has$100 to spend.

A $69:95 B $10:50 C $58:60 D $24:45 E $19:50

a Which item is most expensive?

b Which item is cheapest?

c If Mary buys a tennis racquet, which other item will she not be able to buy?

d If Mary buys a tennis racquet, which other items can she buy and stay within her budget? (Morethan one answer.)

e Can Mary buy shorts, a sports shirt and tennis shoes? Explain your answer.


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Documents

Chapter 7 MONEY...k sixty dollars ten cents l one hundred dollars fifty cents 20c 20c 20c 20c 5c or 50c 20c 10c 5c 5 coins 4 coins Draw simple sketches of the needed to make these