A numerical expression is a mathematical phrase that includes numbers and operations, such as addition, subtraction, multiplication, and division. It does not contain any variables or equal signs. For example, the expression 3 + 5 represents the sum of three and five, which equals eight. Numerical expressions can be simple, like 7 - 2, or more complex, involving multiple operations, such as 4 × (2 + 3). Understanding numerical expressions is essential for solving mathematical problems and performing calculations in everyday life, such as budgeting or measuring ingredients in cooking.