<P> Mnemonics are often used to help students remember the rules, involving the first letters of words representing various operations . Different mnemonics are in use in different countries . </P> <Ul> <Li> In the United States, the acronym PEMDAS is common . It stands for Parentheses, Exponents, Multiplication / Division, Addition / Subtraction . PEMDAS is often expanded to the mnemonic "Please Excuse My Dear Aunt Sally". </Li> <Li> Canada and New Zealand use BEDMAS, standing for Brackets, Exponents, Division / Multiplication, Addition / Subtraction . </Li> <Li> Most common in the UK, India and Australia are BODMAS meaning Brackets, Order, Division / Multiplication, Addition / Subtraction . Nigeria and some other West African countries also use BODMAS . Similarly in the UK, BIDMAS is used, standing for Brackets, Indices, Division / Multiplication, Addition / Subtraction . </Li> </Ul> <Li> In the United States, the acronym PEMDAS is common . It stands for Parentheses, Exponents, Multiplication / Division, Addition / Subtraction . PEMDAS is often expanded to the mnemonic "Please Excuse My Dear Aunt Sally". </Li> <Li> Canada and New Zealand use BEDMAS, standing for Brackets, Exponents, Division / Multiplication, Addition / Subtraction . </Li>

What is please excuse my dear aunt sally
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