GIÁO ÁN TOÁN SONG NGỮ ĐẠI SỐ 7 CẢ NĂM - Chuẩn

- Skill: know how to present rational numbers on a number line.- Attitude: training thinking skills for students.. - Skill: know how to present rational numbers on a number line.- Attitu

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- Skill: know how to present rational numbers on a number line.

- Attitude: training thinking skills for students.

B- Preparations :

1/ Teacher: Text book, lesson plan,

2/ Students: Textbooks, notebooks, reference books ( sách tham khảo)

15,

0   



d)

387

7

197

III/ New lesson:

T : The equal factions are the different ways

for writting,this number is rational number

1 Rational numbers :

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T: Similar to integers , we also present the

rational numbers on a number line (T show

the steps)

T :Request S to represent 3

2

 on a numberline

T : Request S to do exercise 2(work book

-P3)

Eg:

a) 3; -0,5; 0; 27

5

are the rational numbers

b) Rational number can be written b

a

(a, bZ; b 0)c) The set of rational numbers is denoted by Q

2 Representing rational number on a number line:

Step2:4

5

represented by point M is placed to theright of point 0,and the distance from M to 0 is 5new units





0 -2/3

-1

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- Skill: know how to present rational numbers on a number line.

- Attitude: training thinking skills for students.

2/ Students: Textbooks, notebooks, reference books

C- Procedures:

I/ Class organization: - Greeting

- Checking attendance

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T: requests 3 Ss go to the board

T: corrects the results

- T: requests St do ?4

T:How to compare two rational numbers ?

-Eg: request Ss reading text book

T: How is the negative,positive rational

IV Consolidation:

- T: requests st do ex 2(7), st do yourself

- T: requests st do ex (7): + Convert to the same denominator

- Ex: Compare the following rational numbers by the fastest way :

represent the numbers on the number lines:

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181818 





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- Knowlegde: Students understand the rule of adding and subtracting rational numbers, and the rule of “ side moving” in the set of rational numbers.

- Skill: add and subtrcact rational numbers quickly and correctly.

- Attitude: have skill applying the rule of “ side moving”

C- Procedures:

II/ Warm-up:

St 1: present the rule of adding and subtracting fractions which you learnt ingrade

6 ( the same denominators)

St 2: present the rule of adding and subtracting fractions which you learntingrade 6 ( different denominators)

St 3: present the rule of “ side moving”

Teacher’ and Students’ activities Contents

T: Apply properties of operations in Z

1 A dding and Subtracting Rational Numbers

a) Rule:

b y m

b m

a y x

m

b a m

b m

a y x

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T: requests 2 Sts go to the board.

T: requests sts to comment

T: requests Sts to do ?1

T: presents the rule of “ side moving” which Sts

learnt in grade 6  grade 7

T : Requests Sts to show how to find x

T: requests 2 Sts go to the board doing ?2

34

124

334

33

21

3721

1221

497

487

2 T he Rule of “ Side Moving”

a) The Rule (Textbook)

x x

- T requests Sts represent all basic knowledge in the lesson

- Do exercise 6a,b; 7a; 8

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- Skill: multiply and divide rational numbers quickly and correctly.

- Attitude: Sts have careful and corect personality.

C- Procedures:

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II/ Warm-up:

Calculate:

 St 1: a)

3 1.2

- Through warm- up, T ask: present how to

multiply and divide rational numbers?

T: Build the formula to calculate x, y

+ All properties of integer multiplication are

satisfy rational number multiplication T: represent

properties of rational number multiplication

T: Show the formula to calculate x:y?

2 Dividing Two Rational Numbers

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T: Give the note.

T: Compare the difference between ratio of 2

numbers and a fraction

7 7 7.( 7) 49

- The ratio of two rational numbers x and y (y

0) is x:y or

x y

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21 4 8

38 7 3

2 .

21 4 8 ( 2).( 38).( 7).( 3) 2.38.7.3 21.4.8 21.4.8 1.19.1.1 19

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Teaching date:

Period 5 ABSOLUTE VALUE OF RATIONAL NUMBERS.

ADDITION, SUBTRACTION, MULTIPLICATION, DIVISION OF DECIMALS

- Attitude: Sts apply operation properties of rational numbers to calculate

reasonably( hợp lý).

1 The Absolute value of a rational numbers

?1

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T: present absolute value concept of an integer?

T: requests Sts to do ?1 in group

T: discuss in group

T: the groups show solutions

T: writes down outline

T: give some examples

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T: we can do the same as integers.

) = -(1,13+0,64) = -1,394b) (-0,408):(-0,34) = + ( 0, 408 : 0,34

) = (0,408:0,34) = 1,2

?3: Calculate:

a) -3,116 + 0,263 = -( 3,16 0, 263

) = -(3,116- 0,263) = -2,853

b) (-3,7).(-2,16) = +( 3,7 2,16 ) = 3,7.2,16 = 7,992

Requests Sts to do exercises: 18; 19; 20 (P 15)Exercise 18: 4 Sts go to the board

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Exercise 19: Sts discuss in group.

Exercise 20: Sts discuss in group:

d) (-6,5).2,8 + 2,8.(-3,5) = 2,8.( 6,5) ( 3,5)    = 2,8 (-10) = - 28

V Homework:

- Exercise 1- P.15 Textbook, Exercises 25; 27; 28 – P.7;8 Workbook

- Good Sts do more exercise 32; 33 P 8 Workbook

Guide exercise 32: Find max value of A, given that: A = 0,5 - x  3,5since x  3,5  0 hence A max where x  3,5 min  x = 3,5MaxA =0,5 where x = 3,5

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Preparing date: 10/9/2016 Teaching date: 16/9

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Period 6 PRACTICE

A-Objectives:

- Knowlegde: Confirm the absolute value concept of the rational number.

- Skill: training skill compare rational numbers, compute expression value, find x.

- Attitude: develop students' thinking in the form of finding the maximum and minimum value of expression.

C- Procedures:

II/ Warm-up:

* St 1: - Show the formula calculating the absolute value of the rational number x

- Do exercise 24a,b-P7, workbook

* St 2: - Do exercise 27a,c-P8, workbook

III/ Practice:

T: asks St to read request of exercise 28

T: show the rules out brackets ( quy tắc phá

ngoặc)?

Exercise 28 (P8 - workbook ) a) A= (3,1- 2,5)- (-2,5+ 3,1) = 3,1- 2,5+ 2,5- 3,1 = 0c) C= -(251.3+ 281)+ 3.251- (1-281) =-251.3- 281+251.3- 1+ 281

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T: asks St to read request of exercise 29

T: If a 1,5 find a.

T: How many cases are there in the problem?

T: asks Sts do continue N, P at home

T: requests Sts to discuss in group

T: comments, note the order you do the

operations ( lưu ý thứ tự thực hiện phép tính)

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T: Which numbers whose absolute values are

2,3

 How many cases?

T: Which numbers that minus

1

3 equals 0?

T: guiding how to use calculator for Sts

Exercise 25 (P.16- Textbook )a) x 1,7 2,3

 x- 1.7 = 2,3  x= 4 x- 1,7 = -2,3 x=- 0,6

- Eercises 28 (b,d); 30;31 (a,c); 33; 34 P.8; 9 workbook

- Review power of numbers

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Preparing date: 16/9/2016

Teaching date: 23/9

Period 7 POWER OF A RATIONAL NUMBER

A-Objectives:

- Knowlegde: Sts understand power with a natural number exponent concept

of the rational number x, and rules of calculating product, quotient of 2

power with the same base, rule of the power of power.

- Skill: having skill apply rules to calculate.

- Attitude: training careful and correct personality for Sts, scientific resentations ( trinh bay khoa hoc)

T: Give the n-th power definition of natural

number a ( nêu đn lũy thua bậc n của số tự

nhiên a)?

1

Power with a natural number exponent

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T: Similar to power of natural numbers,

power of rational numbers are defined as

follows:

T: when x is written as x=

a b

then xn =

n a

3 33

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- The power of the negative rational number :

+ If the exponent is even number then the its result is positive number

+ If the exponent is odd number then the its result is negative number

- Skill: having skill apply rules to calculate.

- Attitude: training careful and correct personality for Sts, scientific resentations ( trinh bay khoa hoc)

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* St 1: define and write the formula of the n-th power of a rational number x.

* St 2: write the formula computing multiplication and division of two powers

with the same base Find x, given that:

T: requests all Sts to do ?1

T: correct the result

T: give the formula

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T: requests all Sts to do?3

T: through 2 above examples, you represent

how to compute the power of quotient?!

22

5 5

2 2

3 3

3

3 3

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T: requests all Sts to do?5

- Review rules and formulas

- Exercise 38(b, d); Exercise 40 (P.22-Textbook)

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- Knowlegde: confirm rules : multiplication and division of two powers with the same base , the power of power, the power of product and the power of quotient.

- Skill: having skill apply rules to calculate expression values, write in the form of power, compare powers, find unknown numbers.

- Attitude: training careful and correct personality for Sts, scientific resentations.

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T: requests all Sts to do exercise 38

T: How shoud we do?

T: asks Sts go to the board

2

n n n

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T: corrects the results.

n

n n

+ Note: When the power with negative base, if exponent is an even number , we obtain

the result is positive number, and conversely

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-Preparing date: 23/9/2016

Teaching date: 29/9

A OBJECTIVES.

1 Knowledge: Students have to know definition of proportion,terms of proportion

and properties of proportion.

2 Skill: stusents have skill written a proportion for each of division, create as many

as possible proportion from the given equalities or the given proportions, know

find x in the following proportions

3 Education: carefully, precisely in learning for students.

B PREPARATIONS.

- Teacher: Straight ruler, protractor

- Students: Straight ruler, protractor

C PROCESS ORGANIZATION OF TEACHING.

I Organize 7 :………….

II Check your homeworks.

- Student 1: What is the ratio of two numbers ? Denoted?The quotient in the division of number

a by number b(b#0) is called the ratio of a to b

The ratio of a to b is denoted by a : b (also denoted by

- Teacher : What is the equality of two ratios called?

Teacher introduce : the equality

10

15=

1,82,7 is the proportion

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So, what is the proportion? Now,we learn new lesson.

III Teaching and learning new lesson.

T: Read example page 24

T: What is the proportion?

T: Given definition the proportion

d is also writen as a:b =c:d

For instance, the proportion

3 6

4 8 is also writen as 3 : 4

= 6 : 8

Note: In the proportion a:b =c:d:

The numbers a,b,c,d are called terms of proportionThe numbers a,d are called the extremes

The numbers b,c are called the means

5: =

48

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S go to the board do b

T: Let’s comment?

-T: Given the ratio

2,36,9 , write another ratiosuch that two ratios are the proportion ?

T:We have equivalent fractions

Properties 2:(page 25)

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T: What does exercies 44 ask?

S:Replace the following ratios of two

rational numbers by the ratios of two natural

numbers

T: How do you do?

S: Divition rational numbers

If ad = bc và a,b,c,d # 0 then we have the folowwing proportions:

Ex 46(textbook-page 26)

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T guides S do a)

2S go to the boart do b,c

T: What does exercises 46 ask?

T: How can we calculate a; b, c, d from =?

 = - 1,5

- Learn definition of proportion,terms of proportion and properties of proportion.

-Exercise 45;46b,c;47b; 48(page 26 text book)

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and properties of proportion.

2 Skill: stusents have skill written a proportion for each of divition, create as many

as possible proportion from the following numbers, know a famous work by

Supreme Commander Tran Quoc Tuan Forged thinking capacity,calculated.

B PREPARATIONS.

I Organize 7 :………….

II Check your homeworks 15 MINUTES TEST:

Part I: Multiple choise:

Complete each of the following problems by choosing the best option A,B,C or D then write it in your answer sheet:

Problem 1: If ad = bc with a, b, c, d ¿ 0 then we have :

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Problem 2: If 3:4 = 6:8 then 3,8 are:

A The extremes; B The means C The extremes and the means

Problem 4: Find x in the following proportions:

III Teaching and learning new lesson.

T: Introduce about Binh Th YÕu Lîc

T guides : Set equations from 4 given

N=14 B=

13

2 H=-25 U=

34

C=16 I= -63L=0-,3 Ư= -0,84

T=6 Ế=9,17 Y=

14

5 Ợ=

113

 BINH THƯ YẾU LƯỢC

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number

S go to the boart

S answer Ex 52

S explain

How can we calculate

T: How to written as a proportion?

2S go to the boart do a,b

516

=

315316

- The other ratio that can be “reduced” as above is:1

7

78



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(Find x in the following proportions)

T: How do you do?

2S go to the boart do a,b

=> don’t create a proportion(

x x

=> x= ±

45

T: Review knowledge of lession

V Guide home:

- Learn definition of proportion,terms of proportion and properties of proportion.

-Exercise 64,66,68,70 (workbook – page19-20)

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1 Knowledge: Students have to know property of sequence of equivalent ratios and

remark use sequence of equivalent ratios to express the word problems.

2 Skill: stusents have skill find two numbers and use property of secquence of

equivalent ratios about solve the problems with wording in the fact.Forged thinking capacity, calculated.

B PREPARATIONS.



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b)Compare the ratios

III Teaching and learning new lesson

of equivalent ratios

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S: Read property of secquence of

equivalent ratios

S: Read the example(textbook29)

T: Given the example?

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T guides S do ex54

S calculate y?

S go to the boart do exercies 55

T: How do you do?

T: How can we calculate the numbers of

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