Arithmetic and Expressions in C#

Calculate in C# with + - * / and %, know why 5 / 4 is 1, and work out an expression in the order C# does.

Updated

Cheat sheet: Arithmetic and Expressions in C#
Category
C#
Level
Novice
Tags
Arithmetic Operators (c-sharp), c-sharp, Division (c-sharp), Increment Operator (c-sharp), Magic Number, Math Class (c-sharp), Operator Precedence