Python follows the same order of operations you use in math class. Use parentheses () to control what happens first.
Order of Operations
Demo
print(4*10+12)
print(4*(10+12))
Demo
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Today's Objectives
Performing arithmetic on variables
Using floor division, modulus, and exponents
Controlling order of operations with parentheses
Key Terms
Operator
A symbol that performs an operation, such as + or *.
Operand
A value an operator works on.
Expression
A combination of values and operators that produces a result.
Floor Division
Division that drops any decimal remainder, using //.
Modulus
The remainder left over after division, using %.
Order of Operations
The rules that decide which part of an expression is evaluated first.
'F' → Fullscreen
Build
Create a new Python program named 1-4-arithmetic.
Task 1: Basic Operators
Create two number variables, side1 and side2.
Print the sum, difference, product, and quotient of the two variables, each with a label.
Arithmetic Operations
1
side1 =8
2
side2 =5
3
4
print("Sum:", side1 + side2)
5
print("Difference:", side1 - side2)
6
print("Product:", side1 * side2)
7
print("Quotient:", side1 / side2)
8
#
Task 2: Floor Division and Modulus
Print the floor division (//) and modulus (%) of your two variables, each with a label.
Arithmetic Operations
1
side1 =8
2
side2 =5
3
4
print("Sum:", side1 + side2)
5
print("Difference:", side1 - side2)
6
print("Product:", side1 * side2)
7
print("Quotient:", side1 / side2)
8
print("Floor Division:", side1 // side2)
9
print("Modulus:", side1 % side2)
10
#
Task 3: Exponents
Print your first variable raised to the power of your second variable (**), with a label.
Arithmetic Operations
1
side1 =8
2
side2 =5
3
4
print("Sum:", side1 + side2)
5
print("Difference:", side1 - side2)
6
print("Product:", side1 * side2)
7
print("Quotient:", side1 / side2)
8
print("Floor Division:", side1 // side2)
9
print("Modulus:", side1 % side2)
10
print("Exponent:", side1 ** side2)
11
#
Challenge (Optional): Order of Operations
Print the result of an expression that combines addition and multiplication two different ways — once without parentheses, and once with parentheses placed so the result changes.
Checkpoint
Verify your program works correctly.
Example Output
Sum: 13
Difference: 3
Product: 40
Quotient: 1.6
Floor Division: 1
Modulus: 3
Exponent: 32768
Reflection
Answer the following questions before submitting your work.
What is the difference between / and // in Python?
Why did adding parentheses change the result in the Challenge task?
Which operator was the least familiar to you before this activity?
Submit
Submit the required files to the appropriate dropbox.
