PEMDAS (parentheses, exponents, multiplication, division, addition, subtraction)
P- please
E- excuse
M- my
D- dear
A- aunt
S- sally
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The last two operations in P.E.M.D.A.S are 'addition' and 'subtraction'.
Order of operations--Parenthesis, Exponents, Multiplication, Division, Addition, Subtraction. 15-2x2 (fifteen minus two times two) 15-4 11
Because if you did operations in an impermissible order, or violated laws of operations, then your solution to the equation is wrong.
Because if you perform the operations in a different order your answer will be wrong.
The order of operations relate to solving multi-step equations because you are following the order of operations just in a backwards way.