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Numbers Basic Concepts

Types of Numbers

a. Natural Numbers

  • These are the counting numbers starting from 1.
    Example: 1, 2, 3, 4, 5, etc.

b. Whole Numbers

  • These include all natural numbers and zero.
    Example: 0, 1, 2, 3, 4, etc.

c. Integers

  • Integers include all whole numbers and their negative counterparts.
    Example: -3, -2, -1, 0, 1, 2, 3, etc.

d. Even and Odd Numbers

  • Even numbers: Numbers divisible by 2.
    Example: 2, 4, 6, 8, etc.
  • Odd numbers: Numbers not divisible by 2.
    Example: 1, 3, 5, 7, etc.

e. Prime and Composite Numbers

  • Prime numbers: Numbers greater than 1 that have only two factors (1 and itself).
    Example: 2, 3, 5, 7, etc.
  • Composite numbers: Numbers that have more than two factors.
    Example: 4, 6, 8, 9, etc.

Question – Identifying Even and Odd Numbers


In a game, you need to identify the odd numbers from the set {22, 31, 44, 57, 68}.
Solution:

  • Odd numbers: 31, 57.
  • Even numbers: 22, 44, 68.

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