
'BODMAS' Rule:
This rule depicts the correct sequence in which the operations are to be executed, so as to find out the value of given expression.
Here B  Bracket,
O  of,
D  Division,
M  Multiplication,
A  Addition and
S  SubtractionThus, 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
a = a, if a > 0 a, if a < 0 Thus, 5 = 5 and 5 = (5) = 5.

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