SEMI-DETAILED LESSON PLAN IN MATH 3

Demonstrator: Micherose D. Saladaga

School: Dipolog Special Education Center

Date:

I. LEARNING OBJECTIVES:

Cognitive: Multiply 2- to 4- digit numbers by 1- to 2- digit number without regrouping

Psychomotor: Compute the product of 2 numbers with accuracy

Affective: Show accuracy/carefulness in solving number problems

II. LEARNING CONTENT:

Skill: Multiplying 2- to 4-digit numbers by 1- to 2- digit numbers without

regrouping

Reference: BEC PELC I.D.1.1.1.2,

Materials: flash cards, problem written on manila paper

Value: Accuracy/Carefulness

III. LEARNING EXPERIENCES:

A. Preparatory Activities

1. Drill : Multiplication Facts Stations

Assign Little Teachers for each of the Multiplication fact not yet mastered by the

pupils then let each group move from one station to another to recite multiplication facts

for 6, 7, 8 or nine.

Say:

Today, I’m going select a Little Teacher. Whoever will be able to recite the

multiplication facts for a certain number will be our Little Teacher for its station . Then

each group will be moving from one station to another to recite each multiplication facts.

The little teacher will be listening closely as you recite because one mistake will mean

minus 1from the perfect score which is 10 so you will get 9 out of ten which will be

recorded in your station cards. The group that gets the highest total score will be the

winner.

2. Review

Recall the importance of accuracy and carefulness in doing things.

In 6 x 3 = 24. What do you call 8? 3? 24?

Put the factors and the products in the correct box?

4 x 2 = 8 12 x 3 = 36 9 x 5 = 45

6 x 7 = 42 5 x 5 = 25 10 x 6 = 60

11 x 3 = 33 9 x 8 = 72 13 x 3 = 39

FACTORS PRODUCTS

3. Motivation : Message in Boxes

Multiply. Write the letter that is next to each answer in the correct box below. Read the

secret message.

B. Development Activities

1. Presentation

a. Present this problem.

Andres Bonifacio Elementary School received 12 boxes of toys from the

governor of province. Each box had 24 assorted toys. How many toys were there in all?

Let us analyze the problem.

What is asked in the problem? Number of toys in all.

What are given? 12 boxes of toys, 24 assorted toys.

What process will you use? Multiplication

What is the number sentence? What is your answer?

Did you do it this way?

12 x 24 = N 24 = 20 + 4

x 12 = 10 + 2

Tell the pupils that the following solutions used expanded notation.

Step 1: Step 2: Step 3:

20 + 4 20 + 4 24 = 20 + 4

x 10 + 2 x 10 + 2 x 12 = 10 + 2

40 + 8 200 + 40 40 + 8

2 x 4 = 8 10 x 4 = 40 + 200 + 40

2 x 20 = 40 10 x 20 = 200 240 + 48

= 288 toy planes

Introduce now the short method.

Multiply the multiplicand by the ones in the multiplier.

Write the product (48) beginning

from the ones place

Multiply the multiplicand by the tens in the multiplier. Write the product (240)

Multiply by ones. Multiply by tens.

Add the two partial products.

24

x 12

48 }→ partial products

+ 240

288 product

Did you answer correctly the given problem? Check your answer.

Let the class do these on the board.

1) 22 2) 322 3) 31 4) 1 243

x 11 x 3 x 33 x 21

Let the pupils do these on their seats.

1) 23 2) 23 3) 223 4) 312

x 22 x 12 x 23 x 12

2. Guided Practice

a) Game (GIANT STEP)

Teacher will call 5 pupils Provide each pupil illustration board and chalk. They

will stand and start from the back. The teacher will flash the multiplication. The

first one who will give the correct answer will step forward, the one who reaches

first the front desk wins the contest.

1) 232 2) 24 3) 231 4) 321 5) 4 321

x 2 x 22 x 32 x 33 x 2

6) 1 431 7) 324 8) 33

x 12 x 22 x 22

b) Group Activity :( 4 groups)

Give each group an activity card. Each group will present their work after 3

mintes. After working, ask questions that will emphasize the value of accuracy

and carefulness.

Group I = 124 6 321 21

x 2 x 12 x 21

Group II = 221 32 412 13

x 4 x 12 x 12

Group III = 212 4 213 14

x 13 x 12 x 2

Group IV = 212 2 134 23

x 3 x 12 x 13

c) Problem Solving

1. Miss Cruz arrange 142 books in every shell in the library. If there are 12

shelves, how many books are there in all?

2. Gerry spent his vacation working in a supermarket. He worke 8 hours a day for

11 days. How many hours did he work in all?

3. Marnelyn counted 24 small chocolate bars in a package. If there were 21

packages in the shell, how many chocolate bars were there?

4. Marlon elivers 50 letters each day. How many letters does Marlon deliver in 3

days?

5. Tony has 4 packs of pencils. There are 20 pencils in each pack. How many

pencils does Tony have?

3. Generalization

How do you multiply 2- to 4- digit number by 1- to 2- digit number without regrouping?

C. Application

1. What is the greatest product you can get using the digits 3, 2, 1, 4 as factors? Write in

the boxes the factors that will give the largest product.

Product = _____________

2. Pick a number from box X. Multiply it by a number from box Y to find the given

answers.

1) 483 2) 8 620 3) 3 936

X = ______ X = ______ X = ______

Y = _______ Y = _______ Y = _______

4) 504 5) 528 6) 1 023

X = ______ X = ______ X = ______

Y = _______ Y = _______ Y = _______

IV. Evaluation

A. Find the missing digits.

B. Find the product.

1) 234 2) 143 3) 322

x 2 x 21 x 13

4) 2 233 5) 6 321

x 32 x 3

V. Assignment

A. Find the product.

1) 452 2) 313 3) 23

x 11 x 13 x 21

4) 2 431 5) 421

x 22 x 21

B. Solve the following problems.

1. Ellen has 23 pages of stamps. Each page has 112 pieces. How may stamps does she

have

in all?

2. Mang Mario needs 4 poles for his vegetables garden. Each pole should be 122

centimetres

long. What will the total length of 4 poles?

3. The bookstore received a shipment of 13 boxes of books. Each box contained 112

books.

How many books were in the shipment?

4. Puring and Linda are going home after visiting their grandmother. The trip takes 3

hours. If

the bus travels 122 kilometres an hour, how far away is their house?

5. Edith bought 231 pieces of linen paper at P3 each. How much did she spend for the

linen

paper?