1. School : SMP Al-Falah Deltasari Sidoarjo
Subject : Mathematics
Grade/Semester : VIII/1
Main Material : Factorization of algebraic terms
Standard of Competence : Understanding algebraic, relation,
function and straight line equations
Time : 4 x 40’
_________________________________________________________________________
A. Basic Competence
Factorizing the algebraic forms into its factors
B. Indicators
1. To determine the factors of algebraic forms.
2. To factorize the algebraic form into its factors.
3. To solve the division of algebraic form
C. Objectives
After learning the lesson, students are able to:
1. To determine the factors of algebraic forms.
2. To factorize the algebraic form into its factors.
3. To solve the division of algebraic form
D. Material
The algebraic form:
1.
2. and
3. ,
For  with and
For  with and
E. Learning Resources
1. Students Book
2. Worksheet
3. Power point
F. Tools and Materials
1. Algebraic Tile
1
Lesson Plan

2. 2. LCD
3. Laptop
G. Teaching and Learning Activities
Learning Model : Cooperative, type TGT (Team Games Tournament)
Methods : Discussion
Activities Steps :
Third Meeting
I. Introduction (about 10’)
• Greetings
• Basmalah
• Hamdalah
• Syahadatain
• Sholawat
Phase 1: Informing the aim and giving motivation to the students.
1. Students remind factorization of algebraic form
2. Tell students that they will learn about algebraic fraction (for today
factorization by algebraic tile, for , perfect quadratic
trinomials) and convey the learning direction
3. Tell students solve a problem which algebraic fraction concept, for
example: Area of a football field is , determine ability of the
length and width! And we have l = and w = ; or vice versa; or
l = and w = ; or vice versa.
II. Main Activity (about 65’)
Phase 3: Organizing students
4. Organize students into groups of 4 students which heterogenic student
(base on academic ability)
Phase 2: Giving information
5. Explain the material and use algebraic tile to demonstration how to
factorize the algebraic forms
2

3. • Suppose a rectangle has the length of and the width of
then . In other words, the factors of
are and
Question:
Factorize:
a. Take the tiles
+ +
b. Arrange and 1 tiles as shown beside
c. Put tiles to form a rectangle
d. Because a rectangle can be formed, can be factorized.
The length of rectangle is and its width is . Thus,
the factors of are and
• Factorizing , when
Example:
1. List all factors of 3, namely 1 and 3 ; -1 and -3
2. List all factors of -6, namely 1 and -6 ; -1 and 6 ; -2 and 3 ;
and 2 and -3
3. Use the factors to form binomial
4. Place the factors of 3 inside the box , and the factors of -6 inside
the circle  in the following expression (x + )(x + )
5. Find the multiplication of two binomials. Its middle term, which is
the sum of outer and inner, is equal to
( ) 
3
x2
x x x 1 1
x2
x x
x
1 1

4. ( ) 
( ) 
( ) 
( ) 
( ) 
Thus,
6. Give worksheet 1 to student to discussion together in their team
Phase 4: Guiding practice in learning group
7. Help students who has problem with worksheet 1
8. Students do the worksheet 1 belong 15’
9. Tell the rule of tournament
10. Each teams spread into four tournament tables (base on academic ability)
11. Students collect points as mush as possible in tournament tables belong
15’
12. Students summarize points which they get from each tables
Phase 5: Evaluation
13. Students and teacher discuss together for a few questions in tournament
Phase 6: Giving appreciation
14. The best group (have a good result) get a prize and give motivation to the
group whose the results are not good.
III. Closing (about 5’)
15. Guide students to make a summary of the learning.
16. Students study the topic for next meeting that’s division and fraction in
algebraic form
H. Evaluation
Type of assessment : Oral test
Form of instrument : Subjective test
Example of instrument : Questions in worksheet and quiz
Known by, Sidoarjo, 17 July 2009
The Headmaster of a.n. Mathematics PPL Team
4

5. Al-Falah Junior High School Deltasari
Drs. Sodikin, M. Pd. Izzatul Yazidah
WORKSHEET 1
Name of Group : ………………………
1. …………………………
2. …………………………
3. …………………………
4. …………………………
5. …………………………
Main Material : Factorization of algebraic terms
Standard Competence : Understanding algebraic, relation, function and straight line
equations
Objectives : Students are able to factorize the algebraic form into its factors.
1.
Determine the area of frame above, then factorize!
5
cm
cm

6. 2.
3.
4.
5. 2
6.
7.
8.
9.
10.
6

7. 2.
3.
4.
5. 2
6.
7.
8.
9.
10.
6