toán CD đã sửa (1)

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CHÀO MỪNG

LỚP 4

MÔN TOÁN

KHỞI ĐỘNG

KIỂM TRA BÀI CŨ

Tự chọn hai số bất kì, sau đó:

a Tìm tổng của hai số đó?

b Tìm hiệu của hai số đó?

Thứ hai ngày 23 tháng 8 năm 2021

Toán

Tìm hai số khi biết tổng và hiệu của hai số đó

Bài toán: Tổng của hai số là 70 Hiệu của hai số đó là

10 Tìm hai số đó.

Số lớn

?

Bài toán: Tổng của hai số là 70 Hiệu của hai số đó là 10

Bước 1: Vẽ sơ đồ đoạn thẳng

Bước 2: Chọn 1 trong 2 cách giải sau:

Tìm hai số khi biết tổng và hiệu của hai số đó

Bài 1: Tuổi bố và tuổi con cộng lại được 58 tuổi Bố hơn con

38 tuổi Hỏi bố bao nhiêu tuổi, con bao nhiêu tuổi?

10 + 38 = 48 (tuổi) Đáp số: Con: 10 tuổi

58 – 48 = 10 (tuổi) Đáp số: Bố : 48 tuổi Con: 10 tuổi

Bài 2: Một lớp học có 28 học sinh Số học sinh trai nhiều hơn số

học sinh gái là 4 em Hỏi lớp học đó có bao nhiêu học sinh trai,

bao nhiêu học sinh gái ?

12 học sinh gái.

Bài giải

CẢM ƠN CÁC QUÝ THẦY

CÔ ĐÃ LẮNG NGHE

What is this topic about?

Do you know what helps you make

your point clear?

Lists like this one:

● They’re simple

● You can organize your ideas

clearly

● You’ll never forget to buy milk!

And the most important thing: the

audience won’t miss the point of your

presentation

Problems operations with whole numbers

A pound of pears costs $1.30

Tony bought a pound and a half

of pears If he gave the clerk a

$5.00 bill, how much change will

he get back?

Joe drove for an hour and 25 minutes on Tuesday, 15 minutes

on Wednesday, and 45 minutes

on Friday What was the total number of minutes Joe has been

driven?

Problems operations with whole numbers

II

Susan has 2 oranges She wants

to give one orange to her 5 best

friends so each friend gets the

same amount How much of an

orange will each friend get?

A sport shop sold eight tracksuits, ten caps and five sneakers every day for a week How many tracksuits were sold during the week? And during a month?

Generate and analyze patterns

Which sequences below follow the rule of adding 7?

3, 9, 15, 21 5, 12, 19, 26 6, 10, 14, 18

2, 9, 16, 23 11, 16, 21, 26 1, 9, 17, 25

Interpreting the data from the graphic

Follow the link in the graph to modify its data and then paste the new one here

For more info, click here

List the four students from the shortest to

4 ?

— = —

10 100

A picture is worth a thousand words

Venus has a beautiful name and is the second planet from the Sun It’s terribly hot, even hotter than Mercury, and its atmosphere is extremely poisonous It’s the

second-brightest natural object in the night sky after our Moon

Denominator (can be any whole number except 0)

Add the top numbers and put them over the same denominator

The last step, simplify the fraction

— + — =

—

6 6 6

3 1 — = —

6 2

Despite being red,

Mars is actually a cold

place It’s full of iron

oxide dust

We remember some concepts

Venus

Venus has a beautiful

name and is the

second planet from the

Sun

Mercury

It’s the closest planet

to the Sun and the smallest one in the Solar System

Saturn was named after the Roman god of wealth and agriculture

Awesome

words

Mercury

Saturn

Geometry concepts

Jupiter is the biggest

planet of them all

Area

Neptune is the farthest planet from

the Sun

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