Math in my world 4 pdf

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Unit 1 _#Digit NUmbers

fe

Unit 2

Practice with 4-Digit NUmbers

Unit3

5--Digit Numbers

Unit 4

Practice with 5-Digit Numbers

Unit5

6 -Digit Numbers; Comparison

Unit 6

_Milion and Millions Period

Unit 7

Units of Mass

Review J

Seconds — Century

_ Unit 9

34

Arithmetic Mean; Chart

:

37

- Unit 10 Addition - Subtraction with Natural Numbers
Review 2

:

-

‘

40
43

Unit 11

Square Decimeter (dm?); Square Centimeter (cm?) 4é

Unit 12

Acute Angle, Obtuse Angle and Staion

Unit 13: -Divisibilily Rules for
2; 5.
Unit 14

Divisibility Rules for 3; 9.

Unit 15 Cumulative Practice
‘Review 3

Angle

49
y

;

82
55

57
_58

mm

Unit 8

Hi, friends! Welcome to Math in My World Alin
We will go on the journey to explore the world
math and we will find out how interesting it is

Before we start, let's see how well you know

about math! Are you ready? Let's get started!


Fill in the blanks.

2. Multiply.
Example:
9x8=72
We say: “Nine times eight equals seventy-two.”

30 M16. osgandvnteogsig

x

1

Bi

nN

N

3x9=.....

lào

1l.

TỔ TA Ô = aapscrarenawssons

:


3. Choose and circle the correct answer.
Example:

64:8=.........

(A)8

B.9

&ÿ

We say: “Sixty-four divided by eight equals eight, so Eight is the correct
answer and we choose and circle letter A.”

4.

Jd.

72:8=.........

A.8

B.9

C.7

bs

3224 = sewn

A. 8

Ba?

€.7

CG,

6359 = suena

A. 8

B.9

G.7

d.

42:ó=.........

A.8

B.9

6.7

Long, Hoa and Oanh like apples very much. Each of them can eat
3 apples at a time. How many apples can they eat at a time in all?

Solution
Each student can eat 3 apples at a time.
The apples three students can eat at a time are:
3X3 =

(apples)
Answer:......... apples

5. A class of 30 students went to the zoo by taxis. Each
6 students. How many taxis did the students need?
Solution
1 taxi is for 6 students.
The taxis for 30 students are:

AnswWer:......... †oxis

taxi can

carry

6.

Nam

practices playing the guitar for 2 hours a day.

How many hours does he practice in 6 days?

Solution
The hours he practices in 6 days are:

_ 7. Khoi has 8 tapes of his favorite songs.
Each tape has 9 songs on it. How many songs does Khoi have in all?
Solution
The songs Khoi has in all are:


Chapter

|
a

4-Digit and
5-Digit Numbers

Im lost.
\ Help me, please!

What’ your

address, kid?

It’s

one

thousand

| five hundred eleven
Lac

Long

street, Miss.

Quan


1 Thousơnd

Write in number: 1,126

1 Hundred

1Ten

1 One

_

Write in words: One thousand one hundred twenty-six

10


Let's practice
1. Read and match.
Eight thousand eight hundred ninety

TUT

Three thousand eight hundred eighty-one
One thousand two hundred seventy-four

Two thousand one hundred eighteen
Seven thousand five hundred fifty-seven

Three thousand three hundred sixty
Four thousand four hundred fifty

2. Place the value of the digit in the following numbers.

©

ee

Example: Place the value of seven thousand five hundred twenty-two:

thousands

hundreds

tens

ones

ê ê

e

a. Place the value of four thousand five hundred six:

hundreds

tens

ones
@

thousands

11

om


eee

eee
thousands

hundreds

i

tens

ones

c. Place the value of nine thousand six hundred ninety-nine:

thousands

hundreds

tens

ones

]. Fill in the box with >, < or =.

3,352 | < | 3,358

We say: “Three thousand three hundred
thousand three hundred fifty-eight.”

a.

2/22

b.

4027

fifty-two

is less than

three

2,292
—

4/207

c. —

2/202

2,202

d.

7.575

7,557

me

Example:

2. Find the sum then write in words.

Example:
4,001 + 9 = 4,010 > Four thousand one plus nine equals four thousand
a. 2,009 + 11

= senenwarensuess

b. 9,900 +10 +19

=...............

G6: 5,009 + 9] + TÔ E;.s...e.seo

ten.

Te
Fy tens

i

ile

RES

ESN So ASST UPTON

Si trpng3E Phgh ÿmANtrBE SE GI- UV BE SPHIUEERIDSGERSEISSiSEOitdE

Math in my world
Write the numbers in words and say what they are used for.
Car number plate

13


AES

Practice with i Digit NumberS
TERCHER lug

1. Write the numbers in words. Which D108) does digit 5 belong to ingach

number?

Bar

mài

Example:
2,453: Two thousand four hundred fifty-three and digit 5 belongs to Tens.
OC: 5,248!

cisecisassaesssaeseernnieemaveniiarna
isan enna
ENS

bb: 25438

sciscnsescnemnnasmnlleancnnnem
aise acme mnacceneneses

“`...

eee

C. 3/625:. . . . . . . . . . HH
Q:6/AQĐ?,

reo

|

taanynadiitioitttttottoiontitttgingttdsittS0SSDH101/8G1T9040TĐUĐĐSESSRGSSL038-20810

2. Write in numbers.

c?

|

i

|

Example: Four thousand three hundred: 4,300.

L

a. Five thousand three hundred SIXtOON: ..........eeesecessesssesssoeceseceneececeeeeeteeees

!

: b. Two thousơnd †hree hUndredl Oné:: ....................
--- cv 1S 1115151 EsEEskserse

'

c. Seven †housœndl four hundredl †wenÏy-On6: ........................ che.

;

d. Nine thousand nin©Ïy-DÌG: ‹‹:...¿¿ ¿cai
4ã515t11 168 cú g1 86114 586451465815466

l

3. Find the sum then write it in words.
Example: 5,291 + 9 = 5,300:
G8;798 +2 FS arccrneerseaesd —

b. 8,889 + ] =...................... n.

Five thousand three hundred
txoHBÖA0-OIISDEERSIASKQENHU THIEEESRIRPHLHSOENOORE

.ẽẽốẽố
vế

sẽ

6; 3,794 +3 E vogydgpngDaiiiOIE . „ tgxgdostEDSSALĐASEASSETSSAfiXSE9X1983543013915358100ay1xNEASEOR

le §E.Sc:.Je. CN

PT"...

na

an


4. Problem solving.
a. A modern submarine has a test depth of 1,300 m and is estimated to

submerge 400 m more. How deep can the submarine go?
Solution
The depth the submarine can go is:

1,300 + 400 =................ (m).

b. A baseball team plays 1,620 games in 10 years. If it lost 109 games,
how many games did it win? (There are no ties in baseball.)
Solution
The number of games the baseball team won is:
1,620- 109 =.................... (games).

15

10 Thousands

_1 Thousand

1 Hundred

1Ten

Write in number: 11,126

“ap

Write in words: Eleven thousand one hundred twenty-six

16

1 One


2. Write in numbers or words.

Example:

A2,736

a. Twenty-seven thousand thirty

b. 99,999

c. Ten thousand seven hundred eight


1.

Fill in the box with >,
Example: 40,328 | < | 43,028
We say: “Forty thousand three hundred twenty-eight is less than forty-three
thousand twenty-eight.”

a.

19,985

19,958

c.

27/003

26,999

b. 82,35ó

82,356

2. Arrange the following numbers from least to greatest:
29,878;

23,989;

29,837;

29,838;

29,887.

Math in my world

Write down

the number

in words and

say

what you see.

Write down

the number in words and say

what it is used for. —


Practice with 5-Digit Numbers
ie \

1. Fill in the blanks.
a. Fill in the blanks under the number line with suitable numbers:

0

10,000

ssswavesss

30,000

sưa
ngư ướn nnnmaen

b. Fill in the blanks.
4ó,000; 47,000;............. [net
Cai tí tọNeHE 2308:2101010012801008220 ; 51,000;.................
2.

Fillin the boxes.
Write

in word:


3. Ordering

numbers.

a. Arrange the following numbers from least to greatest:

65,371;

75,631;

56,731;

67,35]

b. Arrange the following numbers from greatest to least:
82,697,

4.

62,978;

92,678;

79,862

hundred

seventy

Fillin the box with >, < or =.

Example:
We

say:

43,270 | > | 37,420
“Forty-three

thousand

,
two

thirty-seven thousand four hundred twenty.
a.

28,676

28,676

b.

58,700

58,900

G;

97,021

d.

ó5,300

.

- 97,400
95,300

20

is greater

than


` Di TU)

we

;

A

Numbers; Capacity
and Mass

How much do you weigh?
Are you overweight?

2I

ee

Unit5 ) 6-Digit Numbers; C

1. One - Ten - Hundred

2.

Thousand —Ten thousand — Hundred thousand
10 hundreds = 1 thousand = 1,000
10 thousands = 1 ten thousand = 10,000

10 ten thousands = 1 hundred thousand = 100,000

Write in number: 432,516

Write in words: Four hundred thirty-two thousand five hundred sixteen

-'Ổ?-