BODMAS Rule : This rule depicts the correct sequence in which the operations are
to be executed, so as to find out the value of a given expression.
Here, 'B' stands for 'Bracket, 'O' for 'of', 'D' for 'Division','M' for 'Multiplication',
'A' for 'Addition' and 'S' for 'Subtraction'.
Thus, in simplifying an expression, first of all the brackets must be removed, strictly
in the order (), {} and [].
After removing the brackets, we must use the following operations strictly in the
order :
(i) of (ii) Division (iii) Multiplication (iv) Addition (v) Subtraction.

Modulus of a Real Number : Modulus of a real number a is defined as _{ l a l = }^{a, if a > 0} ^{- a, if a < 0.}
Thus, l 5 l = 5 and l -5 l = - (- 5) = 5.

Virnaculum (or Bar) : When an expression contains Virnaculum, before applying the
'BODMAS' rule, we simplify the expression under the Virnaculum.