Shortcut methods for Bank Quantitative Aptitude Questions?

Shortcut methods for Bank QA

1)To square any number ended wid 5
e.g. 65*65
solution: 1)Square R.H.S of given no.i.e. 5*5=25
2)Multiply the L.H.S no. by 1 more
i.e.6*7=42
3)concatenate answers of step2 and step1
i.e. 42 and 25 =4225
so SQUARE of 65 = 4225.






2)To square any number between 30 to 70
Square of 52
a)Subtract 52 from 50 i.e 52-50=02
b)Add it wid 25 i.e. 25 02 = 27
c)now square the result of step a
i.e. 02*02 = 04
d)Now merge the answer of b and c
i.e. 27 and 04 so it become 2704
square of 52 is 2704.
for number less than 50 only we have to change step b rather to add we subtract the result of step a by 25 in step b
note in case of 62 where
in step a) as 62-50 =12
step b)25 12 = 37
step c)12*12=144
step d) merge it as
37
144
answer is: 3844




3) How to multiply any no.with 11
e.g.
23543456*11 = 258978016
a)write 1st and last digit as it is
b)now add all consecutive no. and write it in
between 1st and last digit also use concept of
carry add from right side of number
2(2 3)(3 5)(5 4)(4 3)(3 4( 1carry))(4 5( 1carry))
(5 6)6 = 258978016

perhaps i think u can understand the above trick or it will be in long term in ur mind

square of any TWO DIGIT NUMBER number

say 24^2
CONSIDER 24 AS AB
step I - B^2
STEP II- 2*A*B + ANY CARRIED FORWARD OF STEP Ist
step III A^2 +CARRIED FORWARD OF STEP IInd

lets take 24^2
STEP I- 4^2 = 16 WRITE 6 AND ONE CARRY FORWARD TO NEXT STEP 6
STEP II 2*2*4 +1( CARRY FORWARD OF STEP iST) 17 WRITE 7 AND 1 CARRY FORWARD 7
STEP III 2^2 +1 CARRY FORWARD OF STEP II 5
============
24^2 ANS 576

Thanks for sharing.

Originally Posted by Sharad Jain

Shortcut methods for Bank QA


1)To square any number ended wid 5
e.g. 65*65
solution: 1)Square R.H.S of given no.i.e. 5*5=25
2)Multiply the L.H.S no. by 1 more
i.e.6*7=42
3)concatenate answers of step2 and step1
i.e. 42 and 25 =4225
so SQUARE of 65 = 4225.






2)To square any number between 30 to 70
Square of 52
a)Subtract 52 from 50 i.e 52-50=02
b)Add it wid 25 i.e. 25 02 = 27
c)now square the result of step a
i.e. 02*02 = 04
d)Now merge the answer of b and c
i.e. 27 and 04 so it become 2704
square of 52 is 2704.
for number less than 50 only we have to change step b rather to add we subtract the result of step a by 25 in step b
note in case of 62 where
in step a) as 62-50 =12
step b)25 12 = 37
step c)12*12=144
step d) merge it as
37
144
answer is: 3844




3) How to multiply any no.with 11
e.g.
23543456*11 = 258978016
a)write 1st and last digit as it is
b)now add all consecutive no. and write it in
between 1st and last digit also use concept of
carry add from right side of number
2(2 3)(3 5)(5 4)(4 3)(3 4( 1carry))(4 5( 1carry))
(5 6)6 = 258978016

perhaps i think u can understand the above trick or it will be in long term in ur mind

Can you please the change the color of the font. Unable to read.

Thanks a lot for sharing valuable information...