Term: 2^{nd} Term
Week: 5
Class: Senior Secondary School 3
Age: 17 years
Duration: 40 minutes of 2 periods each
Date:
Subject: Computer studies and ICT
Topic: Basic operations with binary numbers
SPECIFIC OBJECTIVES:
At the end of the lesson, pupils should be able to
INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, videos from source
INSTRUCTIONAL MATERIALS: Videos, loud speaker, pictures, Data Processing for senior Secondary Education by Hiit Plc, WAPB Computer Studies for Senior Secondary III by Adekunle et al, Online Materials.
INSTRUCTIONAL PROCEDURES
PERIOD 12
PRESENTATION 
TEACHER’S ACTIVITY 
STUDENT’S ACTIVITY 
STEP 1 INTRODUCTION 
The teacher reviews the previous lesson on octal and hexadecimal number bases 
Students pay attention 
STEP 2 EXPLANATION 
He explains the rules for adding and subtracting binary numbers and solves some examples

Students pay attention and participates 
STEP 3 DEMONSTRATION 
He then explains the rules of multiplying and dividing binary numbers and solves some examples 
Students pay attention and participate 
STEP 4 NOTE TAKING 
The teacher writes a summarized note on the board 
The students copy the note in their books 
NOTE
BASIC OPERATIONS ON BINARY NUMBERS
ADDITION OF BINARY NUMBERS
We can add binary numbers in the same way as we separate with ordinary base 10 numbers.
The identities to remember are:
0 + 0 = 0,
0 + 1 = 1,
1 + 0 = 1,
1 + 1 = 10,
1 + 1 + 1 = 11,
1 + 1 + 1 + 1 = 100
The identities to remember on subtraction are:
0 – 0 = 0,
1 – 0 = 1,
10 – 1 = 1,
11 – 1 = 10,
100 – 1 = 11
In multiplication,
0 x 0 = 0,
1 x 0 = 0,
1 x 1 = 1.
When there is long multiplication of binary numbers, the principle of addition can be used to derive the answer. Under division, the principle of subtraction can be used.
EXAMPLES
110
× 110
000
110
+ 110
100100
111100
101 = 110
EVALUATION: 1. Explain the basic rules for these operations in binary
2i. Solve the following exercises
a. 101 + 11 =
b. 111 + 111 =
c. 1010 + 1010 =
d. 11101 + 1010 =
e. 11111 + 11111 =
ii.
iii.
iv.
CLASSWORK: As in evaluation
CONCLUSION: The teacher commends the students positively