BIDMAS is an acronym to help you remember the order of mathematical operations:
Brackets
Indicies
Division
Multiplication
Addition
Subtraction
Another anagram for this is "bodmas" identical, but the "o" stands for "power of":
Brackets
power Of
Division
Multiplication
Addition
Subtraction
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If it is BIDMAS you want then it means: B brackets I indices D divide M multiply A addition S subtract
BIDMAS, BODMAS and BEDMAS all pretty much mean the same thing, although BEDMAS is the least used, BODMAS is used by most mathematicians, and BIDMAS is mainly used for teaching people about it.
2 * 3 - 7 + 8, although you don't require BIDMAS for that!
BracketsIndeciesDivideMultiplyAddSubtractBracketsOverDivideMultiplyAddSubtract
brackets indices division multiplication addition subtraction