NUMERICAL & ALGEBRAIC EXPRESSIONS

 NUMERICAL & ALGEBRAIC EXPRESSIONS

Constants

• A constant is a number that doesn't change
• Examples: $4$, $12$, $-7$, $100$

Variables

• A variable is a letter that represents an unknown value
• Common variables include $x$, $y$, $n$, and $a$
• The value of a variable can change

Expressions

1. Numerical Expressions

   • Contains only numbers and operations
   • Example: $5+3\times 2$
   • Example: $12÷4-1$

2. Algebraic Expressions

   • Contains variables, numbers, and operations
   • Example: $3x+4$
   • Example: $2y-5$
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