• addition and subtraction of money in decimal notation

• solving word problems involving addition and subtraction 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

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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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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.

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2. What is the sum of $12.60 and $18.45?

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2. What is the sum of $12.60 and $18.45?

12.60

+ 18.45

Align the numbers accordingly. Please make sure the decimal point is aligned.

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2. What is the sum of $12.60 and $18.45?

12.60

+ 18.45

5

12.60 + 18.45 .05

+1

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2. What is the sum of $12.60 and $18.45?

12.60

+ 18.45

5

12.60 + 18.45 .05

+1 12.60 + 18.45 1.05

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2. What is the sum of $12.60 and $18.45?

12.60

+ 18.45

5

12.60 + 18.45 .05

12.60 + 18.45 31.05

+1 +1 12.60 + 18.45 1.05

Try this out!

2. What is the sum of $12.60 and $18.45?

12.60

+ 18.45

5

12.60 + 18.45 .05

12.60 + 18.45 31.05

+1 +1 12.60 + 18.45 1.05

Answer: $31.05

Are you ready to try out the questions?

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