I. OBJECTIVES
1. Analyze word problems involving sum of arithmetic sequence. 2. Solve word problems involving sum of arithmetic sequence. 3. Relate solving word problems involving sum of arithmetic sequence in real-life situations.

II. SUBJECT MATTER
Topic:Solving Word Problems involving Arithmetic Sequence Reference:Intermediate Algebra by Dilao and Bernabe
Instructional
Materials:DLP Projector (PPT Presentation), Cartolina Strips, Chalk, Blackboard, Drill Board

III. STRATEGIES
A. Preparatory Activities
1. Opening Prayer
2. Greetings
3. Checking of Attendance
4. Energizer
5. Checking of Assignment

B. Review
The teacher will ask the students to answer the following: a. What is the arithmetic mean between 9 and 49?
b. Insert three (3) arithmetic means between 2 and 14.

C. Motivation
The teacher will present a short math song to be sung by the students.

D. Lesson Presentation
➢ The teacher will ask the students to analyze the math problems stated in the math song presented to them. ➢ The teacher will post another problem and will let the students analyze it. Illustrative Example:

1. An auditorium has 20 seats on the first row, 24 seats on the second row, 28 seats on the third row, and so on and has 30 rows of seats. How many seats are in the theatre?

➢ The teacher will discuss how to solve the sample problems using the formula: [pic]

E. Generalization
How do you solve word problems involving sum of arithmetic sequence?

F. Application
(Group Activity)
The class will be grouped into four (4) and let them discuss/answer the following questions for 20 minutes.