Multiplication is when you add n xs together.1
3x5 = 5+5+5 = 3+3+3+3+3 = 15
0xn = 0 (n is any number)

Important properties:

  • Associative Property of Multiplication
  • Commutative Property of Multiplication
  • Identitive Property of Multiplication

    Notes:

  • Positive times positive = positive
  • Negative times positive = negative
  • Negative times negative = positive

    See also: Multiplication tables, Addition, Subtraction, Division

    1 It's been suggested to me that this explanation may not work too well once you consider imaginary numbers.