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# CHAPTER 2

## Whole Numbers (II)

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Multiplying By Tens, Multiplying By Tens, Multiplying By Tens, Multiplying By Tens,
Hundreds Or Thosands Hundreds Or Thosands Hundreds Or Thosands Hundreds Or Thosands

1. Find the values of the following:

a. 7140 x 10 = ____________________
b. 1503 x 10 = ____________________
c. 3702 x 10 = ____________________

2. Fill in the blanks.

a. _______________ x 10 = 700
b. 308 x _________________ = 3080
c. _______________ x 10 = 5000

3. Fill in the blanks.

a. 39 x 30 = 39 x _____________ x 10
= ___________ x 10
= _________
b. 143 x 90 = 143 x ______ x ______
= _____ x _________
= _________
c. 285 x 40 = 285 x ______ x ______
= _____ x _________
= _________

Math
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4. Fill in the blanks.

a. 17 x ___________ = 1700
b. _________ x 1000 = 25 000
c. _________ x 1000 = 478 000
d. 320 x __________ = 320 000
e. 1315 x _________ = 131 500
f. __________ x 100 = 2 662 000

5. Fill in the blanks.

a. 4 x 300
= 4 x _____________ x 100
= ______________ x 100
= _____________
b. 35 x 600
= 35 x __________ x 100
= ________ x 100
= ________
c. 5400 x 800
= 5400 x ______ x 100
= __________ x 100
= ___________
d. 12 x 3000
= 12 x ______ x 1000
= _______ x 1000
= _______
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e. 300 x 4000
= 300 x _______ x 1000
= _________ x 1000
= __________

6. Do these.

Multiplying by tens Multiplying by hundreds Multiplying by thousands
a. 65 x 30 = 65 x 300 = 65 x 3000 =
b. 812 x 10 = 812 x 100 = 812 x 1000 =

7. Fill in the blanks.

a. 31 x _____________ = 3100
b. 30 x _____________ = 90 000
c. 103 x ____________ = 3090
d. 25 x _____________ = 5000

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Whole Numbers (II)

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8. Imagine you are a shopkeeper of an electronics store. Estimate the amount of earnings
you will get from the sales of each group of items below.

Round off the 2-digit numbers to the nearest ten, the 3-digit numbers to the nearest
hundred and the 4-digit numbers to the nearest thousand. Then estimate the product.

a. 58 x 219 _______ x _________
= __________

b. 99 x 217 _______ x ________
= _________

c. 13 x 2415 __________ x _________
= __________

58 all-in-one printers at \$219 each.
652 radio clocks at \$73 each.
99 portable audio players at \$217 each.
39 plasma television sets at \$4156 each.
13 refrigenerators at \$2415 each.
37 sets of home entertainment systems at \$6814 each.
CHAPTER 2
Whole Numbers (II)

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Dividing by Tens, Dividing by Tens, Dividing by Tens, Dividing by Tens,
Hundreds Or Thousand Hundreds Or Thousand Hundreds Or Thousand Hundreds Or Thousand

1. Find the values of the following:

a. 100 10 = _____________
b. 1050 ___________ = 105
c. 52 260 10 = ___________

2. Fill in the blanks.

a. 1040 40 = 1040 _________ _______
= ______ 3
= _______
b. 8700 60 = 8700 _____ _____
= ________ _______
= ________
c. 34 230 70 = 34 230 _________ _________
= __________ __________
= __________

3. Divide

a. 3400 100 =
b. 7700 100 =
c. 360 000 1000 =

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4. Divide

a. 300 300 = 300 _____ _______
= _______ ______
= __________

b. 45 000 500 =

c. 9000 3000 =

d. 31 500 500 =
e. 36 000 400 =

f. 120 000 8000 =

5. Do these

Dividing by tens Dividing by hundreds Dividing by thousand
a. 1190 70 = 11 900 700 = 119 000 7000 =

b. 3600 40 = 36 000 400 =

360 000 4000 =

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6. Fill in the blanks.

a. 49 000 _____________ = 7
b. 2400 _____________ = 120
c. 85 000 ___________ = 17

7. Estimate the Quotient.

a. 7865 41 _____________ __________
= __________
b. 9825 206 _____________ ____________
= __________
c. 5299 49 ___________ _________
= __________

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Whole Numbers (II)

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Order Of Operations Order Of Operations Order Of Operations Order Of Operations

1. Find the value of each of the following. Write down each step. Then use your calculator

a. 26 + 8 - 19 = _________
Step 1 : __________________________
Step 2 : __________________________
b. 58 - 23 + 11 - 6 = _________
Step 1 : __________________________
Step 2 : __________________________
Step 3 : __________________________

2. Find the value of each of the following. State the order of operations.

Order

+ +
a. 60 18 7 =
b. 70 15 49 =
c. 15 12 + 17 6 =

3. Find the value of each of the following. Write down each step. Then use your calculator

a. 54 6 + 20 4 = _____________
Step 1 :
Step 2 :
Step 3 :
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b. 25 4 36 9 = _____________
Step 1 :
Step 2 :
Step 3 :

4. Find the value of each of the following. State the order of operations.

Order
a. 60 3 + 14 2 =
b. 13 6 2 + 4 =
c. 64 60 + 12 3 =

5. Find the value of each of the following. Write down each step. Then use your calculator

a. 15 11 9 = ____________
Step 1 : ______________________
Step 2 : ______________________
b. 11 + 5 16 = ____________
Step 1 : ______________________
Step 2 : ______________________

c. 63 9 7 = ____________
Step 1 : ______________________
Step 2 : ______________________
d. 32 14 + 2 = ____________
Step 1 : ______________________
Step 2 : ______________________

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6. Find the value of each of the following. State the order of operations.

7. Find the value of each of the following. Write down each step. Then use your calculator

a. 21 + 12 + 6 3 = ________
Step 1 : ____________________
Step 2 : ____________________
Step 3 : ____________________
b. 7 + 88 4 10 = __________
Step 1 : ____________________
Step 2 : ____________________
Step 3 : ____________________

c. 32 7 + 1 9 5 = _________
Step 1 : ____________________
Step 2 : ____________________
Step 3 : ____________________
d. 47 + 12 10 5 3 = _________
Step 1 : ____________________
Step 2 : ____________________
Step 3 : ____________________

Order
a. 3 72 8 =
b. 40 5 11 =
c. 36 15 2 =
d. 36 15 2 =
e. 62 + 10 6 =
f. 70 16 9 =
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8. Find the value of each of the following. State the order of operations.

Order
a. 100 + 720 + 200 2 =
b. 60 5 + 7 20 30 =
c. 7 6 18 6 =
CHAPTER 2
Whole Numbers (II)

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Word Problems (I) Word Problems (I) Word Problems (I) Word Problems (I)

Solve these word problems. Show your working clearly.

1. A Tae-Kwon-Do club had 146 members. Each member paid \$30 a month for training
fees. How much fees did the club collect in a year.

2. Mr Lim has \$4500. He wants to give all the money to some children at a Childrens
Home.
a. If each child gets \$25, how many children are there?
b. If he wants to give each child \$32, how much more money does he need?

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3. A group of tourists visited the Underwater World. The entrance fees were priced at \$13
for each adult and \$7 for each child. There were 10 adults and 18 chilredn in the group.
How much did they pay altogether?

4. The length of a rectangular wooden planks is 10 cm longer than its breadth. Its breadth
is 26 cm. the wooden plank is cut into 9 similar pieces. What is the area of each piece of
wooden plank?

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5. There are 918 yellow chairs and blue chairs altogether in an auditorium. The blue chairs
arranged in 36 rows with 12 chairs in each row. The yellow chairs are arranged in rows
of 18. How many rows of yellow chairs are there?

6. The table shows the wages of workers in Sivas company. Siva works from Tuesday to
Sunday each week. How much does he earn in on week?

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7. The table shows the charges at a carpark.

First hour \$2

hour
\$1

a. Kim Lian parked her car at the carpark from 9.30 a.m. to 11 a.m. on the same day.
How much did she have to pay?

b. Daryll parked his car there from 9 a.m. to 12.30 p.m. on the same day. How much did
have to pay?

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Whole Numbers (II)

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Word Problems (2) Word Problems (2) Word Problems (2) Word Problems (2)

Solve these word problems. Show your working clearly.

1. A box of chalk and 2 2 dusters costs \$10.
3 boxes of chalk and 2 dusters cost \$18.
Find the total cost of 1 box of chalk and 1 duster.
2. Sally and Mabel had the same number of cards at first. After Sally sold 18 of
her cards, Mabel had four times as many cards as Sally.
How many cards did each girl have at first?
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3. A basket with 65 sweets has a mass of 3200 g. The same basket with 40
sweets has a mass of 2125 g. each sweet has the same mass.
What is the mass of the basket?

4. A carton can hold 850 cm
3
of blackcurrant juice. Grace wants to buy 15 such
cartons of blackcurrant juice. Every 250 cm
3
of blackcurrant juice costs \$1.
How much does she have to pay altogether?
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Whole Numbers (II)

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Challenging Challenging Challenging Challenging Practise Practise Practise Practise
1. Mr Tan puts up poles from one end of a road to the other at equal distances apart.
There are 27 woodens poles. The width of each pole is 10 cm. the distance between
2 poles is 30 m. Find the length of the road.
2. Krishnan had 64 coins in his coin box. There were 20-cent coins and 50-cent coins.
The total value of all the coins was \$18.50. how many 20-cent coins and how many
50-cent coins were there?

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Whole Numbers (II)

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Problem Solving Problem Solving Problem Solving Problem Solving
1. Daisy, Joo Lun and Florence share \$268. Joo Lun has \$20 more than Daisy and
Florence has twice as much money as Joo Lun. How much money do Daisy dan Joo
Lun have altogether?
2. Xuxian and Rachel had the same number of marbles. After Rachel gave away 10
marbles and Xuxian gave away 22 marbles, Rachel had 3 times as many marbles as
Xuxian. How many marbles did each of them have at first?
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3. Gerry had a total 30 pens and pencils at first. He then decided to exchange all his
pens for pencils. If he exchanged every pen for 2 pencils, he would have 48 pencils.
How many pens and pencils did he have at first?
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