its actually "please excuse my dear aunt sally"
i dont know who invented it and i dont know why you would want to know
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It's actually Please Excuse my Dear Aunt Sally... Parentheses Exponents Multiplication Division Addition Subtraction :) It's a little ditty for 3rd and 4th graders when they are taught Order of Operations. I still use it too!
1st step: ???? Its call PEMDAS ( please excuse my dear aunt sally) P= parenthesis ( ) E= exponents M= multiplication D= Division A= Addition S= Subtraction You always solve left to right and start with any ( ) and then exponents, mult, division ECT.....
Parenthesis, Exponents, Multiplication, Division, Addition, Subtraction (remember that multiplication and division occur at the same time starting at the left and moving right and the same is true of addition and subtraction. So the six letters: PEMDAS Which is commonly expressed as Please Excuse My Dear Aunt Sally or Purple Elephants Marching Down A Street.
It means you have to solve the problem in parentheses first. ex: 2X4+5= 13; 2X (4+5) = 18. The answer is different because you have to solve the problem in the Order of Operations. 1) Parentheses 2) Exponents like 22 3) Multiplication 4) Division 5) Addition 6) Subtraction PEMDAS or Please Excuse My Dear Aunt Sally.