In my understanding, you want to name " 1+2+3-6", correct?Any names for that? We do have a word for it in my first language.
I feel odd to call it'math operations', maybe it's even wrong?
We can call that a mathematical operation or, more precisely, an arithmetical operation.What do we call math operations such as '3 + 5 - 6'?
Expression (mathematics) - WikipediaIn mathematics, an expression or mathematical expression is a finite combination of symbols that is well-formed according to rules that depend on the context. Mathematical symbols can designate numbers (constants), variables, operations, functions, brackets, punctuation, and grouping to help determine order of operations, and other aspects of logical syntax.
Definition of ExpressionExpression
Numbers, symbols and operators (such as + and ×) grouped together that show the value of something.
Example: 2×3 is an expression