**Extra for Experts:
Formulas**

The *
Intermediate Guide to Microsoft Excel 2010* demonstrated a dozen
or so essential formulas.

Many
spreadsheets use recursive or very complicated math functions, such
as computing energy or figuring out the cost per unit of an area or
volume. You may have wondered what can you do to make sure the math
is right.

**PEMDAS**
is an acronym that was invented to help folks remember the Oder of
Operations. All equations follow PEMDAS, no matter how complex or
simple the formula may be.

**1.
Consdier This: The** **Order of Operation**

(P) Parentheses, first

(E)
Exponents (or Powers)

(M)
Multiplication

(D)
Division

(A)
Addition

(S)
Subtraction

Keep
going...