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

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