• multiplication and division of money in decimal notation

• solving word problems involving the 4 operations of money in decimal notation

What will we learn today?

Measurement Money

There are different denominations (value) of coins and notes we use in Singapore.

How do we write in cents and dollars

10 cents $0.10

20 cents $0.20

30 cents $0.30

40 cents $0.40

50 cents $0.50

60 cents $0.60

70 cents $0.70

80 cents $0.80

90 cents $0.90

1 dollar $1

Try this out!

1. Tommy bought a pair of pants for $25 and two shirts for $18 each. He gave the cashier two fifty-dollar notes. How much change did she receive from the cashier?

Try this out!

1. Tommy bought a pair of pants for $25 and two shirts for $18 each. He gave the cashier two fifty-dollar notes. How much change did she receive from the cashier?

Try this out!

1. Tommy bought a pair of pants for $25 and two shirts for $18 each. He gave the cashier two fifty-dollar notes. How much change did she receive from the cashier?

Step 1: 2 x $18 = $36 (2 shirts)

Try this out!

1. Tommy bought a pair of pants for $25 and two shirts for $18 each. He gave the cashier two fifty-dollar notes. How much change did she receive from the cashier?

Step 1: 2 x $18 = $36 (2 shirts)

Step 2: $36 + $25 = $61 (shirts and pants)

Try this out!

1. Tommy bought a pair of pants for $25 and two shirts for $18 each. He gave the cashier two fifty-dollar notes. How much change did she receive from the cashier?

Step 1: 2 x $18 = $36 (2 shirts)

Step 2: $36 + $25 = $61 (shirts and pants)

Step 3: 2 x $50 = $100

Try this out!

1. Tommy bought a pair of pants for $25 and two shirts for $18 each. He gave the cashier two fifty-dollar notes. How much change did she receive from the cashier?

Step 1: 2 x $18 = $36 (2 shirts) Step 2: $36 + $25 = $61 (shirts and pants) Step 3: 2 x $50 = $100 Step 4: $100 - $61 = $39 She received $39 from the cashier.

Try this out!

2. Kate bought a blouse and 2 skirts. She gave the cashier $100 and got back $39.25 as change. A skirt cost twice as much as a blouse. How much did a skirt cost?

(1) $12.15

(2) $20.25

(3) $24.30

(4) $40.50

Solution

2. Kate bought a blouse and 2 skirts. She gave the cashier $100 and got back $39.25 as change. A skirt cost twice as much as a blouse. How much did a skirt cost?

Step 1: $100- $39.25 = $60.75

Solution

2. Kate bought a blouse and 2 skirts. She gave the cashier $100 and got back $39.25 as change. A skirt cost twice as much as a blouse. How much did a skirt cost?

Step 2: $60.75 ÷ 5 = $12.15

Since a skirt cost twice as much as a blouse, there are 5 units in total.

Solution

2. Kate bought a blouse and 2 skirts. She gave the cashier $100 and got back $39.25 as change. A skirt cost twice as much as a blouse. How much did a skirt cost? Step 3: $12.15 x 2 = $24.30 Since a skirt cost twice as much as a blouse, we have to multiply by 2, to get the cost of the skirt.

Solution

2. Kate bought a blouse and 2 skirts. She gave the cashier $100 and got back $39.25 as change. A skirt cost twice as much as a blouse. How much did a skirt cost?

Step 3: $12.15 x 2 = $24.30

Answer: $24.30

Are you ready to try out the questions?

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