What is a numerical expression?

Answer 1

5+6+36-4=43

* * * * *

That is an equation, not an expression. An expression might be 5+6+36-4 or 43 but when you put the + sign (or <, > etc) it becomes an equation (or inequality).

Answer 2

A numerical expression in math terms has numbers and operations

like for an example

1. 4+9

2. (8-2)+5

Answer 3

an expression with only numbers in it