LESSON PLAN 57: Understanding Operators

LESSON PLAN 57: Understanding Operators

Lesson Details

Strand: 3.0 Software Development
Sub Strand: 3.3 Identifiers and Operators
Duration: 40 minutes (Single lesson)
Lesson: 4 of 6
Class Level: Grade 10

Key Inquiry Question (Lesson Starter)

How do programs perform calculations and make decisions?

Specific Learning Outcomes

By the end of the lesson, the learner should be able to:

• a) use operators in a programming language,
• b) discuss the categories of programming operators (arithmetic, assignment, increment and decrement, relational, logical),
• c) write and execute programs that involve the use of operators,
• d) appreciate the role of identifiers and operators in programming.

Selected Learning Experiences

Introduction (5 minutes)

• Review homework: Check temperature converter and personal bio programs
• Present key inquiry question: “How do programs perform calculations and make decisions?”
• Real-world connection: “Calculators, games, and apps all use operators. Even deciding ‘if you pass or fail’ requires operators!”
• Quick demonstration: Write on board: 10 + 5 = 15 and ask “What is the + symbol called?” (operator)
• Brainstorm: What other math symbols do you know? (+, −, ×, ÷)
• Introduce lesson focus: Understanding different types of operators in programming

Development Activities (30 minutes)

Activity 1: Categories of Operators (12 minutes)

• Discuss the categories of programming operators (arithmetic, assignment, increment and decrement, relational, logical)
• Teacher uses projector and whiteboard to present each category

1. Arithmetic Operators (calculations) Write on whiteboard:

python

a = 10

b = 3

# Addition

print(a + b)      # 13

# Subtraction

print(a – b)      # 7

# Multiplication

print(a * b)      # 30

# Division (decimal result)

print(a / b)      # 3.333…

# Integer Division (whole number only)

print(a // b)     # 3

# Modulus (remainder)

print(a % b)      # 1

# Exponentiation (power)

print(a ** b)     # 1000

2. Assignment Operators (storing values)

python

# Simple assignment

x = 5

# Compound assignment

x += 3    # Same as: x = x + 3 (now x = 8)

x -= 2    # Same as: x = x – 2 (now x = 6)

x *= 4    # Same as: x = x * 4 (now x = 24)

x /= 2    # Same as: x = x / 2 (now x = 12)

3. Relational Operators (comparisons – result is True or False)

python

a = 10

b = 5

print(a == b)    # Equal to: False

print(a != b)    # Not equal to: True

print(a > b)     # Greater than: True

print(a < b)     # Less than: False

print(a >= b)    # Greater than or equal: True

print(a <= b)    # Less than or equal: False

4. Logical Operators (combining conditions)

python

# AND – both must be True

print(True and True)      # True

print(True and False)     # False

# OR – at least one must be True

print(True or False)      # True

print(False or False)     # False

# NOT – reverses True/False

print(not True)           # False

print(not False)          # True

# Example with conditions

age = 15

grade = 10

print(age > 14 and grade == 10)  # True (both true)

• Project examples on screen while writing on board
• Explain each operator with real examples
• Create summary chart on whiteboard

Operators Summary Chart:

Category	Operators	Purpose	Example
Arithmetic	+, -, *, /, //, %, **	Math calculations	5 + 3 = 8
Assignment	=, +=, -=, *=, /=	Store/update values	x = 10
Relational	==, !=, >, <, >=, <=	Compare values	10 > 5 → True
Logical	and, or, not	Combine conditions	True and False → False

Activity 2: Guided Practice Worksheet (10 minutes)

• Write and execute programs that involve the use of operators
• Distribute printed worksheets with operator exercises
• Students work individually, using whiteboard chart as reference

Worksheet Exercises:

Part A: Identify the Operator Category Match each expression to its category:

1. x = 15 → __________ (Assignment)
2. 10 > 5 → __________ (Relational)
3. a + b → __________ (Arithmetic)
4. True and False → __________ (Logical)
5. score += 10 → __________ (Assignment)

Part B: Predict the Output What will be printed?

python

1. print(8 + 2)           # ?

2. print(8 – 2)           # ?

3. print(8 * 2)           # ?

4. print(8 / 2)           # ?

5. print(8 % 2)           # ?

6. print(10 == 10)        # ?

7. print(10 != 5)         # ?

8. print(5 > 3 and 2 < 4) # ?

Part C: Write Expressions Write Python expressions for: