The document discusses multiplication and division of money in decimal notation. It provides examples of writing dollar amounts in cents and examples of word problems involving calculating totals and change from purchases. One example problem asks what change a customer would receive after buying clothes totaling $61 and paying with $100. Another example asks how much a skirt costs if it is twice the price of a blouse and the total purchase and change amounts are given.

1. Measurement
Money
What will we learn today?
• multiplication and division of money in
decimal notation
• solving word problems involving the 4
operations of money in decimal
notation

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

4. 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

5. 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?

6. 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?

7. 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)

8. 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)

9. 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

10. 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.

11. 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

12. 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

13. 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.

14. 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.

15. 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

16. Are you ready to
try out the
questions?

17. Visit kungfumath.sg today!