Psp 21 25

PSP 21PSP 21

Unit: Fractions

Question 1

The mass of one of the sacks is the massof the other

3

4

One sack

The other sack

42

7 units -> 4242 ÷ 7 = 6 (1 unit)4 x 6 = 24 (4 units, heavier sack)

Answer: 24 kg

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Question 2

Jody has as much money as Charlie.4

9

Jody

Charlie$650

13 units -> 650650÷13= 50 (1 unit)50 x 9 = 450 (9 units, Charlie)

Answer: $450

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Question 3

The cost of the mini-compo set is the costof the television set.

5

7

Mini-compo

Television

$2520

12 units -> 25202520 ÷ 12= 210 (1 unit)210 x 5 = 1050 (5 units, mini-compo)

Answer: $1050

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Question 4

The purse costs as much as the bag.3

4

purse

bag $35

7 units -> 3535 ÷ 7= 5(1 unit)5 x 4 = 20 (4 units, bag)

Answer: $20

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PSP 22PSP 22

Unit: Fractions

Question 1

Carol’s mass is of George’s.7

9

Carol

George

24 kg

2 units -> 2424 ÷ 2= 12 (1 unit)9 x 12 = 108 (9 units, George)

Answer: 108 kg

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Question 2

The cost of the clock is of the cost of thewatch.

4

7

clock

watch

$48

3 units -> 4848 ÷ 3= 16 (1 unit)16 x 11 = 176 (11 units, total)

Answer: $176

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Question 3

The amount of money in Zilong’s wallet is ofthe amount in Mary’s handbag.

4

9

Zilong

Mary

$25

5 units -> 2525 ÷ 5= 5 (1 unit)5 x 4 = 20 (4 units, total)

Answer: $20

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Question 4

The number of boys in a hall is the numberof girls.

5

8

Zilong

Mary

72

3 units -> 7272 ÷ 3= 24 (1 unit)13 x 24 = 312 (13 units, total)

Answer: 312

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PSP 23PSP 23

Unit: Fractions

Question 1

After giving away of his pencils...1

3 totalHow many units left? 3 – 1 = 2

pencils

left

rulers

left 10 70

70 – 10 = 60 (5 units)60 ÷ 5 = 12 (1 unit)12 x 3 = 36 (3 units, pencils at first) Answer: 36

Question 2

If he sells away of his chickens…3

4 totalHow many units left? 4 – 3 = 1

chickens

left

ducks

left 400 700

700 – 400 = 300 (5 units)300 ÷ 5 = 60 (1 unit)400 +60 = 460 (ducks)60 x 4 = 240 (chickens)460 – 240 = 220 (ducks more than chickens) Answer: 220

Question 3

After spending of her $2-notes….1

3 totalHow many units left? 3 – 1 = 2

$2-notes

left

$5-notes

left 10 50

(a) 50 – 10 = 40 (5 units)40 ÷ 5 = 8 (1 unit)8 x 2 = 16 (2 units)16 + 10 = 26 ($5-notes) Answer: (a)26 (b)

$178

(b) 8 x 3 = 24 (total number of $2-notes)$2 x 24 = $48 (total value of $2-notes)26 x $5 = $130 (total value of $5-notes)$130 + $48 = $178

Question 4

She gave of her balls to Jane …1

5 totalHow many units left? 5 – 1 = 4

balls

left

marbles

left 10 82

82 – 10 = 72 (9 units)72 ÷ 9 = 8 (1 unit)8 x 4 = 32 (4 units, marbles at first) Answer: 32

PSP 24PSP 24

Unit: Fractions

Question 1

Have equivalent

fractions so you can add or minus easily!

Answer: 40

Question 2

Have equivalent fractions so you can add or minus easily!

Answer: 720

Question 3

Have equivalent fractions so you

can add or minus easily!

(a)

Question 3

b)

Answer: (a)48 (b)_____

PSP 25PSP 25

Unit: Fractions

Question 1

I spent of my money on a bag….1

5 totalRemainder -> 5 – 1 = 4

pencilsbag remainde

r

blouse

$90 ÷ 3 = $30 ( 1 unit)$30 x 5 = $150 (at first)Answer: $150

$90

Question 2

I spent of my money on a television set….

1

9 totalRemainder -> 9 – 1 =8Television

setremainde

r

refrigerator

$420 ÷ 3 = $140 (1 unit)$140 x 5 = $700 (refrigerator)Answer: $700

$420

Question 3

of the coins in a box are 10-cent coins …2

11

total(Remainder -> 11 units – 2 units = 9 units)

10-cent coins

remainder

$1-coins

5 units – 2 units = 3 units ($1-coins more than 10-cent coins)30 ÷ 3 = 10 (1 unit)10 x 2 = 20 (10-cent coins)10 x 5 = 50 ($1-coins)10 x 4 = 40 (50-cent coins)$140 x 5 = $700 (refrigerator)

50 –cent coins

Question 3

20 x 10 cents = 200 cents = $2 ( value of 10-cent coins)50 x $1 = $50 (value of $1 coin)40 x 50 cents = 2 000 cents = $20 (value of 50-cent coins)$2 + $50 + $20 = $72Answer: a)20 (10-cents coins), 50 ($1 coins), 40 (50-cents coins)b)$72