Lesson 4: Numbers and Math

Topics Covered:

• Working with numbers in Python
• Basic arithmetic operations
• Converting between strings and numbers

Working with Numbers

You can store numbers in variables and do math with them:

a = 10
b = 3
sum = a + b
print(sum)

Basic Math Operators

• + Addition
• - Subtraction
• * Multiplication
• / Division
• % Modulus (remainder)
• ** Exponentiation

print(5 * 4)   # 20
print(8 / 2)   # 4.0
print(7 % 3)   # 1
print(2 ** 3)  # 8

Combining Input with Math

Use int() or float() to convert input to numbers:

num1 = int(input("Enter a number: "))
num2 = int(input("Enter another number: "))
print("The sum is:", num1 + num2)

Challenge Task

• Ask the user for two numbers.
• Print the result of adding, subtracting, and multiplying them.

a = float(input("First number: "))
b = float(input("Second number: "))

print("Addition:", a + b)
print("Subtraction:", a - b)
print("Multiplication:", a * b)