🔢 Numbers

Last Updated: 06-Sep-2025

Numbers are symbols we use to count, measure, and calculate in real life.
Without numbers, we cannot talk about money, time, age, marks, or even programming.

Types of Numbers

  1. Natural Numbers (1,2,3,4,…)
    • Used for counting objects.
    • Example: "I have 3 apples."
  2. Whole Numbers (0,1,2,3,4,…)
    • Same as natural numbers plus zero.
    • Example: "I have 0 chocolates left."
  3. Integers (… -3, -2, -1, 0, 1, 2, 3 …)
    • Includes negative numbers.
    • Example: "Temperature is -5°C in winter."
  4. Fractions & Decimals (½, 0.5, 3.14)
    • For dividing things.
    • Example: "I ate half pizza = 0.5 pizza."
  5. Complex Numbers (a + bi)
    • A number with a real part and an imaginary part.
    • Example: "2 + 3i is a complex number."

✏ Example

  • Money: If you borrow ₹50, it’s like -50 (negative). If you earn ₹200, it’s +200.
  • Temperature: Above 0°C → positive, below 0°C → negative.
  • Bank balance: Positive = savings, Negative = loan.

Note : We will cover more number types in upcoming sections.

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