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multiplication/division from left to right, then addition/subtraction from left to right
Multiplications and divisions from left to right.
Yea because the collection of rules that define which procedures to perform first order to evaluate a given mathematical expression.
There is no known origin of the order of operations or PEMDAS. PEMDAS is considered as the proper way to tackle a given mathematical expression in terms of what operation should be performed first.
Naegele's Rule is a mathematical formula often used in pregnancy due date calculators. This is a formula that adds 7 days to the first LMP and then subtracting three months from that figure.