Monomials are mathematical expressions that have only one term. They can be numbers, variables, or combinations of numbers and variables raised to a power. To perform operations with monomials, we can use basic math operations like addition, subtraction, multiplication, and division.

For example, let's say we have two monomials: "5x" and "3x". We can add them to get a new expression: "5x + 3x", which is still a monomial because it only has one term. If we multiply them, we get "15x^2", which is also a monomial because it only has one term.

So, to perform operations with monomials, we use basic math operations like addition, subtraction, multiplication, and division. We can add monomials to get a new monomial, multiply monomials to get a new monomial, and so on.