# Lesson Notes By Weeks and Term - Primary 3

WEEK 5

Subject: Mathematics

Class: Primary 3

Term: 1st Term

Subbtitle: Addition of 2 and 3 digit numbers

Learning Objectives: At the end of this this lesson, pupils should be able to:

2. add 3 numbers taking two at a time

Resources and materials:

Scheme of work

Online information

Instructional material: number charts

Building Background/connection to prior knowledge: pupils are familiar with the topic in their previous classes.

CONTENT��

Addition of 2-digit numbers with renaming

Addition of 2-digit numbers with renaming is solved by using:

• the expanded method and,
• the direct or short method.

Examples

Lets add 28 and 84 using the:

Expanded method

1. 2 8 = �� 20 + 8 �����������������������������������������2 8

+� � � � 8 4 =� �+ 80 + 4� �������������������������������������+ 8 4

��������������������� 100 +12 = 100 + 10 + 2������������ �1 1 2

In the units column, 8 + 4 = 12 units = 10 + 2, which is

1 ten and 2 units. Write 2 units in the units column and

carry 1 ten to the tens column. In the tens column,

1 + 2 + 8 = 11 tens = 10 tens + 1 ten, which is 1 hundred

and 1 ten. Write 1 ten in the tens column and carry

1 hundred to the hundreds column.

1. 9 4 =�� 90 + 4���������������������������������������� ����9 4

���� + 8 9 =�� 80 + 9�������������������������������������� ���+ 8 9

• + 3 =170 + 10 + 3 1 8 3

�������������������������������� =183

Addition using direct method or short cut

1. 73 + 37

� 7� 3

+3� 7

� 110� �

1. 54 + 23�

� 5� 4

+2� 3

7� 7

1. 359 = 300 + 50 + 9
2. 914 = 900 + 10 + 4
3. 800 + 40 + 2 = 842
4. 500 + 60 + 4 = 564
5. 4 3 8

� � � �+ 4 1 1

� � � � � 8 4 9

��

1. 8 7 3

� � � �+ 1 2 4

� � � � � 9 9 7

Strategies& Activities:

Step1: Teacher revises the previous topic.

Step2: Teacher introduces the new topic.

Step3: Teacher explains the new topic.

Step4: Teacher welcomes pupils questions.

Step5: Teacher evaluates the pupils.

Assessment & Evaluation:

1. 23 + 40
2. 45 + 22
3. 54 + 49
4. 745 + 201
5. 361 + 144

WRAP UP(CONCLUSION) Teacher goes over the topic once again for better understanding.