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Subtraction is one of the basic operations in mathematics. It represents taking away or removing one quantity from another. When we perform subtraction, we start with a larger number, called the 'minuend', and subtract a smaller number, known as the 'subtrahend'. The result is called the 'difference'.
In the expression 15 - 9:

• 15 is the minuend.
• 9 is the subtrahend.
• The difference is the result of the subtraction, which is 6.

Subtraction is symbolized by the minus sign (-). For example, if we have 15 apples and we give away 9 apples, we are left with 6 apples. This is subtraction in everyday terms. It's important to understand that subtraction is the opposite of addition.

A mathematical expression is a combination of numbers, symbols, and operations that represent a specific value or calculation. Expressions can include numbers, variables (like x or y), and operations such as addition (+), subtraction (-), multiplication (*), and division (/). In our example, 15 - 9 is a simple mathematical expression.
Mathematical expressions are used to model real-world situations and solve problems. For instance, the expression 15 - 9 could model a situation where you have 15 candies and give away 9. The value of the expression helps us determine how many candies are left.
In more complex expressions, parentheses () can be used to group terms and clarify the order of operations. For example, in the expression \((8+2) - 3\), the addition inside the parentheses is performed first, before the subtraction.

Math notation refers to the symbols and signs used to represent numbers and operations in mathematics. It provides a universal language to describe mathematical ideas and calculations. In the expression 15 - 9, the key notations are:
- Numbers: 15 and 9, which are represented using standard numerical digits.
- Minus Sign (-): This symbol indicates that a subtraction operation is to be performed.
Notations make it possible to write complex ideas in a concise and understandable way. There's a standard set of notations used internationally, making it easier for people from different backgrounds to understand and perform mathematical operations.
Understanding math notation is essential because it helps you read and interpret mathematical expressions correctly. If you know that the minus sign means subtraction, you can easily translate any subtraction expression, like 20 - 4, to 'twenty minus four'.