Multiplication
Operation that, to each pair of numbers called the factors of the multiplication, associates a new number called the product of these factors.
The inverse operation of multiplication is division.
Symbol
The symbol of multiplication is "×" which is read as "multiplied by".Properties
- (a) Multiplication is a commutative operation. Example : 12 × 15 = 15 × 12
- (b) Multiplication is an associate operation. Example : (12 × 15) × 10 = 12 × (15 × 10)
- (c) Multiplication has an identity element. Example : 12 × 1 = 1 × 12
- (d) Any number multiplied by 0 gives 0 as a result. Example : 12 × 0 = 0 × 12 = 0
Example
Consider this multiplication of whole numbers: 5 × 7 = 35 The numbers 5 and 7 are called the factor of the multiplication. The number 35 is the product.
Educational Note
The symbol "×" appeared in a text by the mathematician William Oughtred called Clavis Mathematicae in 1631. The same year, mathematician Thomas Harriot (1560-1621) used a large dot "." as a symbol of multiplication. In fact, Harriot used this dot to separate a coefficient from a variable, as in "6 . y ."
William Oughtred (1574-1660)