Python 3b – Simple Calculations

Core Operators

Python uses the standard arithmetic operators:

• + addition
• - subtraction
• * multiplication
• / division (returns a float)

print(89 + 47)
print(89 - 47)
print(89 * 47)
print(89 / 47)

Remember: use * (asterisk) for multiply and / (forward slash) for divide.

User-Friendly Output

Combine text with answers so results are easy to read:

print("53 x 7 =", 53 * 7)   # commas add spaces automatically

This prints: 53 x 7 = 371

Using Variables in Calculations

Store numbers in variables and calculate with them:

num1 = 12
num2 = 20
total = num1 * num2
print("The total is", total)

Using User Input

Let the user supply numbers (convert text input with int()):

num1 = int(input("Enter number one: "))
num2 = int(input("Enter number two: "))
answer = num1 - num2
print(num1, "-", num2, "=", answer)

Simple Calculations Task 1 – +, -, *, ÷

Write four separate calculations—one using each operator—and display a clear message for each. (Tip: copy the divide symbol: ÷)

print("18 + 35 =", 18 + 35)
print("18 - 35 =", 18 - 35)
print("18 x 35 =", 18 * 35)
print("18 ÷ 35 =", 18 / 35)

Simple Calculations Task 2 – Divide by 3

Ask the user to enter a number, divide it by 3, and print the result.

number = int(input("Enter a number: "))
print(number, "divided by 3 is", number / 3)

Simple Calculations Task 3 – Add 3 Numbers

Prompt the user for three numbers, add them up, and print the total.

num1 = int(input("Enter the first number: "))
num2 = int(input("Enter the second number: "))
num3 = int(input("Enter the third number: "))
total = num1 + num2 + num3
print("The total is", total)