b= brackets
o= over power
d= division
m= multiplication
a = addition
s = subtraction
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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.
BODMAS describes the order in which arithmetic operations must be carried out. B = Brackets O = Order (power or index) D = Division M = Multiplication A = Addition S = Subtraction. So 2+3*4 is not to be calculated as 2+3 = 5 and 5*4 = 20 but 3*4 = 12 and 2+12 = 14 BODMAS requires that the multiplication is calculated before the addition.
turki
You need to use BODMAS whenever you evaluate ANY formula.
BODMAS