DETAILED LESSON PLAN IN MATHEMATICS 4
I.
School Name
Doroluman Central Elementary School
Grade Level:
IV-Gold
District
Arakan West
Quarter:
4 quarter
Student Teacher
John Rey T. Caldina
Teaching Date:
April 17,2023
OBJECTIVES
A. Content Standards
The learners demonstrates understanding of concept of time, perimeter, area, and volume.
B. Performance Standards
The learners should be able to apply the concept of time, perimeter, area and volume to mathematical problems and
real-life situations.
The learner finds the area of triangles using sq. cm and sq. m.
(M4ME-IVb-58)
C. Learning Competencies
II.
CONTENT
Finding the Area of Triangle
III.
LEARNING
RESOURCES
A. REFERENCES
1. Teacher’s Guide
Mathematics Teacher’s Guide pp. 272-276
2. Learning Materials
Mathematics Learner’s guide pp. 205-208
3. Textbook Pages
4. Additional Materials
from Learning Resources
(L.R) portals
B. OTHERS LEARNING
RESOURCES
Laptop, PPT, flashcards, etc….
IV.
PROCEDURES
PRELIMINARY ACTIVITY
TEACHER’S ACTIVITY
Prayer
STUDENT’S ACTIVITY



Greetings
Song/Energizer
But before you get be seated let us sing a song first entitled: This is the 
Time.

Very good! Every body give yourself a Kris Aquino clap.
Checking of Attendance
Let us have an attendance first,
When I call your name just say present.
(Math song) This is the Time
1,2,3 (clap) 123 (tramp) Correct!
Present
Last meeting, we discussed about?
Be cooperative
Speak only English and Tagalog,
Raise your right hand if you want to answer
Seat properly
Keep quiet
 Finding the area of Parallelogram
What formula can we use to find the area of parallelogram?

Setting of Classroom Standards
A. Review previous lesson or
presenting the new lesson

Good morning Lord Jesus smile on us today
Give us your blessings us we work and play Amen.
Good morning teacher John Rey, Good morning teacher
Remark, Good morning classmates, Good morning everyone.

What if, the base is unknown? What shall we do? How we can write the 
formula?

How about the height is unknown?
A=bxh
b= A
h
h= A
b
The teacher gives a problem
The area of parallelogram is equal 54m2 and the base is 6m and the
height is unknown. What is the height of Parallelogram?
h=?
b = 6m

To find the height of Parallelogram we use the formula;
h = A/b
= 54m2/6m
= 9m2
In finding a height of Parallelogram the formula that we are going to use is
h = A/b to get the height of Parallelogram:
h = A/b
= 54m2/6m
= 9m2
1,2,3 (clap) 1,2,3 (tramp) ngeng-ngeng, pepep, good job!
Let us give ourselves a driver’s clap.
Drill:
I have here a flash card, every time that I’m going to flash the card you
solve the problem and give me the answer.
1. 8 x 9 = ?
2. 5 x 6 = ?
3. 64 / 8 = ?
4. 81 / 9 = ?
5. 8 x 4 / 2 = ?
The student participates in drill.
1. 8 x 9 = 72
2. 5 x 6 = 30
3. 64 / 8 = 8
4. 81 / 9 = 9
5. 8 x 4 / 2 = 16
Answer:
1. 8 x 9 = 72
2. 5 x 6 = 30
3. 64 / 8 = 8
4. 81 / 9 = 9
5. 8 x 4 / 2 = 16
Very good! Give yourself a good job clap.
B. Establishing a purpose for
the lesson
1,2,3 (clap) 1,2,3 (stamp) good job!
Today we are about to open a new lesson entitled, everybody read.

Finding the area of a Triangle
What shape is this?

Parallelogram
Very good!
And now we are going to draw a diagonal line inside of a Parallelogram
start in one corner to opposite corner for each figure.
So what shape do we formed if we erase the other side?
It called, what shape?

Very good! Let us give ourselves a Coco martin clap!
Triangle
1,2,3 (clap) 1,2,3 (stamp) yun oh!
C. Presenting example
s/instances of the new lesson
Who among you had a friend or relatives named Maris?
Okay, so now I will present to you a situation. All together read the
situation.
Me, Sir.
Maris has a flower garden. The garden is triangular in shape. The base
is 8 meters, and the height is 6 meters. What is the area of the garden?
Maris has a flower garden. The garden is triangular in shape. The
base is 8 meters, and the height is 6 meters. What is the area of
the garden?
1. What is the shape of Maris flower garden?

Very good! Give him/her Aling Dionesia clap
2. What is the base of Maris flower garden?
Very good! Give him/her Aling Dionesia clap
3. What is the height of Maris flower garden?
Very good! Give him/her Aling Dionesia clap
4. What does the problem ask you to find?
Very good! Give him/her Aling Dionesia clap
D. Discussing new concepts
and practicing new skills # 1

And now, let’s discuss on how to find the area of a Triangle, when we say
Area, what are the square units to find the measure of an area?
The shape of Maris flower garden is triangular
(one from the class answered)
1,2,3 (clap) 1,2,3 (stamp), very good 3x.

The base of Maris flower garden is 8 meters.
(one from the class answered)
1,2,3 (clap) 1,2,3 (stamp), very good 3x.

The height of Maris flower garden is 6 meters.
(one from the class answered)
1,2,3 (clap) 1,2,3 (stamp), very good 3x

The area of Maris flower garden, Sir.
(one from the class answered)
1,2,3 (clap) 1,2,3 (stamp), very good 3x

The square units to find the measure of an area are m2, cm2,
in2.
Very good!
And to find the area of a Triangle the formula that we are going to use is
Area equals to base times height divided by two (A = b x h / 2).
And now, we already know how to find the Area of a Triangle. Let us help
Maris to solved her problem to find the area of her flower garden.

So again what is the base of Maris flower garden?
The base of Maris flower garden is 8 meters Sir.
Yes, very good! our base is 8 meters.
So we have a b = 8m
And how about the height of Maris flower garden?

The height of Maris flower garden is 6 meters Sir.

Sir yes sir!
Very good!
The h = 6m
The question is find the area of Maris flower garden.
So we are going to solve:
b = 8m
h = 6m
A=?
A=bxh/2
A = 8m x 6m / 2
A = 48m2 / 2
A = 12m2
Therefore: The Area of Maris flower garden is 12 m2.
To find the height of a triangle we use this formula:
h=2A/b
h = (2)12m2 / 8m
h =48 m2 / 8m
h = 6m
Therefore: the height of Maris flower garden is 6m.
And also to find the base of a triangle we use this formula:
b=2A/h
b = (2) 12m2 / 6m
b = 48m2 / 6m
b = 8m
Therefore: the base of Maris flower garden is 8m.
Did you understand already class how to get the Area, height, and base?
E. Discussing new concepts
and practicing new skills # 2
Let us solve the following problem.
1. Find the area of a triangle?
A=?
h=12cm
b = 8cm
2. h = 2cm
b = 8cm
A=?
A=bxh/2
= 8cm x 2cm / 2
= 16cm2 / 2
A = 8cm2
h = 2cm
b = 8cm
A=?
A=bxh/2
A = 8cm x 2cm / 2
= 16cm2 / 2
= 8cm2
Therefore: the area of a triangle is 8cm2
2. Find the height of a triangle?
3. h = ?
b = 4in
A = 12in2
h =?
A = 12 in2
b =4 in
h=?
b = 4in
A = 12in2
h = 2A / b
= (2)12in2 / 4in
= 24in2 / 4in
h = 6in
Therefore: the height of a triangle is 6in
h = 2A / b
=(2)12in2 / 4in
= 24in2 / 4in
= 6in
Therefore: the height of a triangle is 6in
3. Find the base of a triangle?
b=?
h = 16 ft
A=
h = 16ft
b=?
A = 96ft2
4. h = 16ft
b=?
A = 96ft2
96ft2
b = 2A / h
= (2) 96ft2 / 16ft
= 192 ft2 / 16ft
b = 12ft
Therefore; the base of a triangle is 12ft
b = 2A / h
= (2) 96ft2 / 16ft
= 192 ft2 / 16ft
b = 12ft
Therefore; the base of a triangle is 12ft
4. Find the height of a triangle?
5. h = ?
b = 15yd
A = 150 yd2
h=?
A = 150 yd2
b = 15 yd
h=?
b = 15yd
A = 150 yd2
h = 2A / b
= (2) 150yd2 / 15yd
= 300yd2 / 15yd
= 20yd
Therefore: the height of a triangle is 20yd
h = 2A / b
= (2) 150yd2 / 15yd
= 300yd2 / 15yd
= 20yd
Therefore: the height of a triangle is 20yd
5. Find the area of a triangle
b = 6m
h = 12m
6. h = 12m
b = 6m
A=?
A=?
A=bxh/2
= 6m x 12m / 2
= 72m2 / 2
= 36m2
Therefore: the area of a triangle is 36m2
1. h = 12m
b = 6m
A=?
F. Developing Mastery
A=bxh/2
= 6m x 12m / 2
= 72m2 / 2
= 36m2
Therefore: the area of a triangle is 36m2
Group Activity
 You will be group according to your row. Choose your leader and
reporter respectively.
 Each group will receive materials and activity sheet.
 Present the rubric to be followed while performing the activity.
Criteria
Accuracy
Cooperation
Timeliness
Rubrics
5
3
1
All answers are
correct.
There are one or two
answers are incorrect.
More than two
answers are incorrect.
All members work and
think to answer the
question.
Finished ahead of
time.
There are 1-2
members did not help
to answer the activity.
Finished one minute
before the time.
Only leader and the
reporter do the
activity.
Finished after the time.
Every group solved the following:
Base (b)
Triangle
1
4cm
2
6m
3
12yd
4
5
34dm
Height (h)
2cm
4m
Area (A)
12in
3dm
84yd2
36in2
51dm2
Height (h)
2cm
4m
14yd
12in
3dm
Area (A)
4cm2
12m2
84yd2
36in2
51dm2
The answer:
Triangle
1
2
3
4
5
G. Finding practical
application of concepts and
skills
Base (b)
4cm
6m
12yd
6in
34dm
Each group will select a reporter who will present their work in front.
The first group will present first their works.
Good morning Sir John Rey, good morning Sir Reymark, good
morning classmates. This is the work of group 1.
Triangle
1
2
3
4
5
Base (b)
4cm
6m
12yd
6in
34dm
Height (h)
2cm
4m
14yd
12in
3dm
Area (A)
4cm2
12m2
84yd2
36in2
51dm2
And that’s all. Thank you!
Very good, group 1. Let us give them a wow galling clap.
1,2,3 (clap) 1,2,3 (stamp) wow galling! Wow, wow galing-galing,
And now, let’s go to the next group.
Good morning Sir John Rey, good morning Sir Reymark, good
morning classmates. This is the work of group 2.
Triangle
1
2
3
4
5
Base (b)
4cm
6m
12yd
6in
34dm
Height (h)
2cm
4m
14yd
12in
3dm
Area (A)
4cm2
12m2
84yd2
36in2
51dm2
And that’s all. Thank you!
1,2,3 (clap) 1,2,3 (stamp) Good job!
Very good! Group 2. Let us give them Good job clap.
here you go group 3.
Good morning Sir John Rey, good morning Sir Reymark, good
morning classmates. This is the work of group 3.
Triangle
1
2
3
4
5
Base (b)
4cm
6m
12yd
6in
34dm
Height (h)
2cm
4m
14yd
12in
3dm
Area (A)
4cm2
12m2
84yd2
36in2
51dm2
And that’s all. Thank you!
1,2,3 (clap) 1,2,3 (stamp) Very Good3x
Very good! Group 2. Let us give them Aling Dionesia clap.
It’s your turn group 4.
Good morning Sir John Rey, good morning Sir Reymark, good
morning classmates. This is the work of group 4.
Triangle
1
2
3
4
5
Base (b)
4cm
6m
12yd
6in
34dm
Height (h)
2cm
4m
14yd
12in
3dm
Area (A)
4cm2
12m2
84yd2
36in2
51dm2
And that’s all. Thank you!
1,2,3 (clap) 1,2,3 (stamp) wow galling! Wow, wow galing-galing,
Very good, group 1. Let us give them a wow galling clap.
Good morning Sir John Rey, good morning Sir Reymark, good
morning classmates. This is the work of group 4.
Triangle
1
2
3
4
5
Base (b)
4cm
6m
12yd
6in
34dm
Height (h)
2cm
4m
14yd
12in
3dm
Area (A)
4cm2
12m2
84yd2
36in2
51dm2
And that’s all. Thank you!
Very good! Group 2. Let us give them Good job clap.
Criteria
Accuracy
Cooperation
Timeliness
Total
Group 1
5
5
5
15
Score Sheet
Group 2 Group 3
5
5
5
5
5
5
15
15
Group 4
5
5
5
15
Group 5
5
5
5
15
1,2,3 (clap) 1,2,3 (stamp) Good job!
H. Making generalization and
abstractions about the lesson
I. Evaluating learning
And again,
 What formula that we are going use when we find the area of a
Triangle?
 How about finding a height of a triangle, what formula that we are
going to use?
 And also what formula that we are going to use to find the base of
a triangle?
 The formula that we are going to use when we find the
area of a triangle is A = b x h / 2.
 When we are finding the height of a triangle we use a
formula is h = 2A / b.
 The formula that we are going to find the base of a
triangle is b = 2A / h.
Multiple choice
Direction: Solve the problem to get the best answer then encircle the
letter of the correct answer.
1. h = 6m
b = 12m
A=?
a. 36m2
b. 32m2
c. 38m2
b. 32yd
c. 8yd
d. 48m2
1. b
2. h = 7yd
b=?
A = 49 yd2
a. 6yd
d. 14yd
2. d
d. 8dm
3. a
3. h = ?
b = 14dm
A = 140dm2
a. 20dm
b. 24dm
c. 14dm
4. h = 16cm
b = 6cm
A=?
a. 40cm2
b. 48cm2
c. 26cm2
d. 18cm2
4. b
5. h = 15in
b=?
A = 150in2
J. Additional activities
application or remediation
a. 22in
b. 15in
c. 20in
for Direction: Solve the problem.
d. 20in2
A sailboat has a triangular sail with an area of 280 cm2. If the height of
the sail is 35 cm. What is the base?
1. What is the shape of a sail of a sailboat?
2. What is the area of a sail?
3. What is it ’s height?
4. What is asked in the problem?
5. What will you do to solve the problem?
V.
REMARKS
VI.
REFLECTION
A. No. of learners who earned
87%
on
the
formative
assessment.
B. No. of learners who require
additional
activities
for
remediation.
C. Did the remedial lesson
work? No. of learners who
have caught up with the
lesson.
D. No learners who continue to
require remediation.
E. Which of my teaching
strategies worked well? Why
did this work?
5. c
F. What difficulties did I
encounter which my principal
or supervisor can help me to
solve?
G.
What
innovation
or
localized materials did I
use/discover which I wish to
share with other teacher?
Prepared by:
Checked by:
JOHN REY T. CALDINA
BEED Intern
REYMARK G. YALDA
Critic Teacher