Download - Kungfu math p4 slide18 (money)pdf

Transcript
Page 1: Kungfu math p4 slide18 (money)pdf

• 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

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

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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

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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?

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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?

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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)

Page 8: Kungfu math p4 slide18 (money)pdf

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)

Page 9: Kungfu math p4 slide18 (money)pdf

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

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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.

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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

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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

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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.

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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.

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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

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Are you ready to try out the questions?

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