That type of sentence is called a mathematical expression.
the order of operations
A mathematical phrase that contains operations, numbers, or variables is called an algebraic expression. Algebraic expressions consist of constants (numbers), variables (letters representing unknown quantities), and mathematical operations such as addition, subtraction, multiplication, division, and exponentiation. These expressions can be simplified, evaluated, or manipulated using algebraic rules and properties.
It is an expression.
Expression
An expression.
order of operations
They are terms of an expression or an equation
An Algebraic Expression.
It is evaluating the expression.
variable expression(;
Algebraic expressions is a mathematical phrase that contains operations numbers or variables.