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Subtraction
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Subtraction is one of the four arithmetic operations along with addition, multiplication and division. Subtraction is an operation that represents removal of objects from a collection. For example, in the adjacent picture, there are 5 − 2 peaches—meaning 5 peaches with 2 taken away, resulting in a total of 3 peaches. Therefore, the difference of 5 and 2 is 3; that is, 5 − 2 = 3. While primarily associated with natural numbers in arithmetic, subtraction can also represent removing or decreasing physical and abstract quantities using different kinds of objects including negative numbers, fractions, irrational numbers, vectors, decimals, functions, and matrices.
Placard outside a shop in Bordeaux advertising subtraction of 20% from the price of the second perfume purchased.
1 + ... = 3
1 + ... = 3
The difference is written under the line.
The difference is written under the line.
9 + ... = 5 The required sum (5) is too small.
9 + ... = 5 The required sum (5) is too small.
Multiplication
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Multiplication is one of the four elementary mathematical operations of arithmetic, with the other ones being addition, subtraction, and division. The result of a multiplication operation is called a product.
4 × 5 = 20. The large rectangle is made up of 20 squares, each 1 unit by 1 unit.
4 × 5 = 20. The large rectangle is made up of 20 squares, each 1 unit by 1 unit.
The Educated Monkey—a tin toy dated 1918, used as a multiplication "calculator". For example: set the monkey's feet to 4 and 9, and get the product—36
The Educated Monkey—a tin toy dated 1918, used as a multiplication "calculator". For example: set the monkey's feet to 4 and 9, and get the product—36—in its hands.