Quantitative Aptitude Free-Study Notes
4.
SIMPLIFICATION
A.
‘
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’ and ‘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:
(1)of (2)division (3) multiplication (4)addition (5)subtraction.
B.
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.
C.
Virnaculum (or bar)
:
When an expression contains Virnaculum, before applying the ‘BODMAS’ rule, we simplify the expression under the Virnaculum.