Addition- add two numbers
Subtraction- subtract one from another (usually the small from the larger)
Multiplication- one times another
Division- break up one number by the other (again, usually the bigger by the smaller)
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They are the four basic operations in math.
Addition + Subtraction - Multiplication * Division /
Addition, subtraction, multiplication, and division.
It is most important because everything in math ties back to those four operations.
You do it wrong. With out order of operations, the same math problem could have several different answers. In math, there is only one answer.